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Finding the Fourth Proportional to 1,332.08, 2,005.85 and 987.86

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Solution

The fourth proportional to 1,332.08, 2,005.85 and 987.86 is: 1,487.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.08 : 2,005.85 = 987.86 : x
  2. Step 2: Convert to fraction form
    1,332.08/2,005.85 = 987.86/x
  3. Step 3: Cross multiply
    1,332.08x = 2,005.85 × 987.86
  4. Step 4: Simplify right side
    1,332.08x = 1,981,488.95
  5. Step 5: Solve for x
    x = 1,981,488.95/1,332.08
  6. Step 6: Final answer
    x = 1,487.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.