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Finding the Fourth Proportional to 762.76, 1,052.56 and 431.20

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Solution

The fourth proportional to 762.76, 1,052.56 and 431.20 is: 595.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.76 : 1,052.56 = 431.20 : x
  2. Step 2: Convert to fraction form
    762.76/1,052.56 = 431.20/x
  3. Step 3: Cross multiply
    762.76x = 1,052.56 × 431.20
  4. Step 4: Simplify right side
    762.76x = 453,863.87
  5. Step 5: Solve for x
    x = 453,863.87/762.76
  6. Step 6: Final answer
    x = 595.03

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Double scale
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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.