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Finding the Fourth Proportional to 985.18, 1,477.98 and 491.85

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Solution

The fourth proportional to 985.18, 1,477.98 and 491.85 is: 737.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.18 : 1,477.98 = 491.85 : x
  2. Step 2: Convert to fraction form
    985.18/1,477.98 = 491.85/x
  3. Step 3: Cross multiply
    985.18x = 1,477.98 × 491.85
  4. Step 4: Simplify right side
    985.18x = 726,944.46
  5. Step 5: Solve for x
    x = 726,944.46/985.18
  6. Step 6: Final answer
    x = 737.88

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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.