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Finding the Fourth Proportional to 1,069.32, 1,605.20 and 637.39

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Solution

The fourth proportional to 1,069.32, 1,605.20 and 637.39 is: 956.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.32 : 1,605.20 = 637.39 : x
  2. Step 2: Convert to fraction form
    1,069.32/1,605.20 = 637.39/x
  3. Step 3: Cross multiply
    1,069.32x = 1,605.20 × 637.39
  4. Step 4: Simplify right side
    1,069.32x = 1,023,138.43
  5. Step 5: Solve for x
    x = 1,023,138.43/1,069.32
  6. Step 6: Final answer
    x = 956.81

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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.