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Finding the Fourth Proportional to 1,375.90, 2,064.52 and 645.52

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Solution

The fourth proportional to 1,375.90, 2,064.52 and 645.52 is: 968.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.90 : 2,064.52 = 645.52 : x
  2. Step 2: Convert to fraction form
    1,375.90/2,064.52 = 645.52/x
  3. Step 3: Cross multiply
    1,375.90x = 2,064.52 × 645.52
  4. Step 4: Simplify right side
    1,375.90x = 1,332,688.95
  5. Step 5: Solve for x
    x = 1,332,688.95/1,375.90
  6. Step 6: Final answer
    x = 968.59

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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.