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Finding the Fourth Proportional to 763, 1,053.18 and 487

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Solution

The fourth proportional to 763, 1,053.18 and 487 is: 672.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    763 : 1,053.18 = 487 : x
  2. Step 2: Convert to fraction form
    763/1,053.18 = 487/x
  3. Step 3: Cross multiply
    763x = 1,053.18 × 487
  4. Step 4: Simplify right side
    763x = 512,898.66
  5. Step 5: Solve for x
    x = 512,898.66/763
  6. Step 6: Final answer
    x = 672.21

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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.