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Finding the Fourth Proportional to 1,332.40, 1,997.57 and 920.35

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Solution

The fourth proportional to 1,332.40, 1,997.57 and 920.35 is: 1,379.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.40 : 1,997.57 = 920.35 : x
  2. Step 2: Convert to fraction form
    1,332.40/1,997.57 = 920.35/x
  3. Step 3: Cross multiply
    1,332.40x = 1,997.57 × 920.35
  4. Step 4: Simplify right side
    1,332.40x = 1,838,456.25
  5. Step 5: Solve for x
    x = 1,838,456.25/1,332.40
  6. Step 6: Final answer
    x = 1,379.81

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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.