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Finding the Fourth Proportional to 870.18, 1,200.87 and 477.21

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Solution

The fourth proportional to 870.18, 1,200.87 and 477.21 is: 658.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.18 : 1,200.87 = 477.21 : x
  2. Step 2: Convert to fraction form
    870.18/1,200.87 = 477.21/x
  3. Step 3: Cross multiply
    870.18x = 1,200.87 × 477.21
  4. Step 4: Simplify right side
    870.18x = 573,067.17
  5. Step 5: Solve for x
    x = 573,067.17/870.18
  6. Step 6: Final answer
    x = 658.56

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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.