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Finding the Fourth Proportional to 812.57, 1,121.45 and 497.88

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Solution

The fourth proportional to 812.57, 1,121.45 and 497.88 is: 687.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.57 : 1,121.45 = 497.88 : x
  2. Step 2: Convert to fraction form
    812.57/1,121.45 = 497.88/x
  3. Step 3: Cross multiply
    812.57x = 1,121.45 × 497.88
  4. Step 4: Simplify right side
    812.57x = 558,345.04
  5. Step 5: Solve for x
    x = 558,345.04/812.57
  6. Step 6: Final answer
    x = 687.14

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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.