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Finding the Fourth Proportional to 762.10, 1,143.15 and 437.20

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Solution

The fourth proportional to 762.10, 1,143.15 and 437.20 is: 655.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.10 : 1,143.15 = 437.20 : x
  2. Step 2: Convert to fraction form
    762.10/1,143.15 = 437.20/x
  3. Step 3: Cross multiply
    762.10x = 1,143.15 × 437.20
  4. Step 4: Simplify right side
    762.10x = 499,785.18
  5. Step 5: Solve for x
    x = 499,785.18/762.10
  6. Step 6: Final answer
    x = 655.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.