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Finding the Fourth Proportional to 1,032.16, 1,425.18 and 639.85

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Solution

The fourth proportional to 1,032.16, 1,425.18 and 639.85 is: 883.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,032.16 : 1,425.18 = 639.85 : x
  2. Step 2: Convert to fraction form
    1,032.16/1,425.18 = 639.85/x
  3. Step 3: Cross multiply
    1,032.16x = 1,425.18 × 639.85
  4. Step 4: Simplify right side
    1,032.16x = 911,901.42
  5. Step 5: Solve for x
    x = 911,901.42/1,032.16
  6. Step 6: Final answer
    x = 883.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.