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Finding the Fourth Proportional to 870.73, 1,200.18 and 538.42

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Solution

The fourth proportional to 870.73, 1,200.18 and 538.42 is: 742.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.73 : 1,200.18 = 538.42 : x
  2. Step 2: Convert to fraction form
    870.73/1,200.18 = 538.42/x
  3. Step 3: Cross multiply
    870.73x = 1,200.18 × 538.42
  4. Step 4: Simplify right side
    870.73x = 646,200.92
  5. Step 5: Solve for x
    x = 646,200.92/870.73
  6. Step 6: Final answer
    x = 742.14

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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.