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Finding the Fourth Proportional to 985.66, 1,478.82 and 437.88

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Solution

The fourth proportional to 985.66, 1,478.82 and 437.88 is: 656.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.66 : 1,478.82 = 437.88 : x
  2. Step 2: Convert to fraction form
    985.66/1,478.82 = 437.88/x
  3. Step 3: Cross multiply
    985.66x = 1,478.82 × 437.88
  4. Step 4: Simplify right side
    985.66x = 647,545.70
  5. Step 5: Solve for x
    x = 647,545.70/985.66
  6. Step 6: Final answer
    x = 656.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.