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Finding the Fourth Proportional to 762.88, 1,052.70 and 431.30

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Solution

The fourth proportional to 762.88, 1,052.70 and 431.30 is: 595.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.88 : 1,052.70 = 431.30 : x
  2. Step 2: Convert to fraction form
    762.88/1,052.70 = 431.30/x
  3. Step 3: Cross multiply
    762.88x = 1,052.70 × 431.30
  4. Step 4: Simplify right side
    762.88x = 454,032.14
  5. Step 5: Solve for x
    x = 454,032.14/762.88
  6. Step 6: Final answer
    x = 595.16

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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.