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Finding the Fourth Proportional to 985.92, 1,475.40 and 615.90

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Solution

The fourth proportional to 985.92, 1,475.40 and 615.90 is: 921.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.92 : 1,475.40 = 615.90 : x
  2. Step 2: Convert to fraction form
    985.92/1,475.40 = 615.90/x
  3. Step 3: Cross multiply
    985.92x = 1,475.40 × 615.90
  4. Step 4: Simplify right side
    985.92x = 908,698.86
  5. Step 5: Solve for x
    x = 908,698.86/985.92
  6. Step 6: Final answer
    x = 921.68

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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.