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Finding the Fourth Proportional to 809.40, 1,117.44 and 477.84

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Solution

The fourth proportional to 809.40, 1,117.44 and 477.84 is: 659.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.40 : 1,117.44 = 477.84 : x
  2. Step 2: Convert to fraction form
    809.40/1,117.44 = 477.84/x
  3. Step 3: Cross multiply
    809.40x = 1,117.44 × 477.84
  4. Step 4: Simplify right side
    809.40x = 533,957.53
  5. Step 5: Solve for x
    x = 533,957.53/809.40
  6. Step 6: Final answer
    x = 659.70

Related Problems

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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.