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Finding the Fourth Proportional to 762.87, 1,053.15 and 515.49

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Solution

The fourth proportional to 762.87, 1,053.15 and 515.49 is: 711.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.87 : 1,053.15 = 515.49 : x
  2. Step 2: Convert to fraction form
    762.87/1,053.15 = 515.49/x
  3. Step 3: Cross multiply
    762.87x = 1,053.15 × 515.49
  4. Step 4: Simplify right side
    762.87x = 542,888.29
  5. Step 5: Solve for x
    x = 542,888.29/762.87
  6. Step 6: Final answer
    x = 711.64

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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.