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Finding the Fourth Proportional to 1,028.46, 1,541.84 and 642.90

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Solution

The fourth proportional to 1,028.46, 1,541.84 and 642.90 is: 963.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.46 : 1,541.84 = 642.90 : x
  2. Step 2: Convert to fraction form
    1,028.46/1,541.84 = 642.90/x
  3. Step 3: Cross multiply
    1,028.46x = 1,541.84 × 642.90
  4. Step 4: Simplify right side
    1,028.46x = 991,248.94
  5. Step 5: Solve for x
    x = 991,248.94/1,028.46
  6. Step 6: Final answer
    x = 963.82

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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.