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Finding the Fourth Proportional to 1,377.01, 2,065.85 and 645.73

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Solution

The fourth proportional to 1,377.01, 2,065.85 and 645.73 is: 968.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.01 : 2,065.85 = 645.73 : x
  2. Step 2: Convert to fraction form
    1,377.01/2,065.85 = 645.73/x
  3. Step 3: Cross multiply
    1,377.01x = 2,065.85 × 645.73
  4. Step 4: Simplify right side
    1,377.01x = 1,333,983.10
  5. Step 5: Solve for x
    x = 1,333,983.10/1,377.01
  6. Step 6: Final answer
    x = 968.76

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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.