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Finding the Fourth Proportional to 531.76, 733.90 and 345.40

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Solution

The fourth proportional to 531.76, 733.90 and 345.40 is: 476.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.76 : 733.90 = 345.40 : x
  2. Step 2: Convert to fraction form
    531.76/733.90 = 345.40/x
  3. Step 3: Cross multiply
    531.76x = 733.90 × 345.40
  4. Step 4: Simplify right side
    531.76x = 253,489.06
  5. Step 5: Solve for x
    x = 253,489.06/531.76
  6. Step 6: Final answer
    x = 476.70

Related Problems

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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.