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Finding the Fourth Proportional to 586.76, 809.58 and 390.12

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Solution

The fourth proportional to 586.76, 809.58 and 390.12 is: 538.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.76 : 809.58 = 390.12 : x
  2. Step 2: Convert to fraction form
    586.76/809.58 = 390.12/x
  3. Step 3: Cross multiply
    586.76x = 809.58 × 390.12
  4. Step 4: Simplify right side
    586.76x = 315,833.35
  5. Step 5: Solve for x
    x = 315,833.35/586.76
  6. Step 6: Final answer
    x = 538.27

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Find fourth proportional to 293.38, 404.79 and 195.06
Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.