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Finding the Fourth Proportional to 1,025.67, 1,414.80 and 646.95

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Solution

The fourth proportional to 1,025.67, 1,414.80 and 646.95 is: 892.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.67 : 1,414.80 = 646.95 : x
  2. Step 2: Convert to fraction form
    1,025.67/1,414.80 = 646.95/x
  3. Step 3: Cross multiply
    1,025.67x = 1,414.80 × 646.95
  4. Step 4: Simplify right side
    1,025.67x = 915,304.86
  5. Step 5: Solve for x
    x = 915,304.86/1,025.67
  6. Step 6: Final answer
    x = 892.40

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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.