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Finding the Fourth Proportional to 812.32, 1,121.03 and 497.58

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Solution

The fourth proportional to 812.32, 1,121.03 and 497.58 is: 686.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.32 : 1,121.03 = 497.58 : x
  2. Step 2: Convert to fraction form
    812.32/1,121.03 = 497.58/x
  3. Step 3: Cross multiply
    812.32x = 1,121.03 × 497.58
  4. Step 4: Simplify right side
    812.32x = 557,802.11
  5. Step 5: Solve for x
    x = 557,802.11/812.32
  6. Step 6: Final answer
    x = 686.68

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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.