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Finding the Fourth Proportional to 763.72, 1,053.76 and 498.13

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Solution

The fourth proportional to 763.72, 1,053.76 and 498.13 is: 687.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.72 : 1,053.76 = 498.13 : x
  2. Step 2: Convert to fraction form
    763.72/1,053.76 = 498.13/x
  3. Step 3: Cross multiply
    763.72x = 1,053.76 × 498.13
  4. Step 4: Simplify right side
    763.72x = 524,909.47
  5. Step 5: Solve for x
    x = 524,909.47/763.72
  6. Step 6: Final answer
    x = 687.31

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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.