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Finding the Fourth Proportional to 1,125.60, 1,689.36 and 639.12

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Solution

The fourth proportional to 1,125.60, 1,689.36 and 639.12 is: 959.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.60 : 1,689.36 = 639.12 : x
  2. Step 2: Convert to fraction form
    1,125.60/1,689.36 = 639.12/x
  3. Step 3: Cross multiply
    1,125.60x = 1,689.36 × 639.12
  4. Step 4: Simplify right side
    1,125.60x = 1,079,703.76
  5. Step 5: Solve for x
    x = 1,079,703.76/1,125.60
  6. Step 6: Final answer
    x = 959.23

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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.