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Finding the Fourth Proportional to 586.76, 809.66 and 390.33

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Solution

The fourth proportional to 586.76, 809.66 and 390.33 is: 538.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.76 : 809.66 = 390.33 : x
  2. Step 2: Convert to fraction form
    586.76/809.66 = 390.33/x
  3. Step 3: Cross multiply
    586.76x = 809.66 × 390.33
  4. Step 4: Simplify right side
    586.76x = 316,035.56
  5. Step 5: Solve for x
    x = 316,035.56/586.76
  6. Step 6: Final answer
    x = 538.62

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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.