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Finding the Fourth Proportional to 1,377.38, 2,065.08 and 645.92

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Solution

The fourth proportional to 1,377.38, 2,065.08 and 645.92 is: 968.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.38 : 2,065.08 = 645.92 : x
  2. Step 2: Convert to fraction form
    1,377.38/2,065.08 = 645.92/x
  3. Step 3: Cross multiply
    1,377.38x = 2,065.08 × 645.92
  4. Step 4: Simplify right side
    1,377.38x = 1,333,876.47
  5. Step 5: Solve for x
    x = 1,333,876.47/1,377.38
  6. Step 6: Final answer
    x = 968.42

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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.