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Finding the Fourth Proportional to 1,275.02, 1,912.11 and 658.64

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Solution

The fourth proportional to 1,275.02, 1,912.11 and 658.64 is: 987.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.02 : 1,912.11 = 658.64 : x
  2. Step 2: Convert to fraction form
    1,275.02/1,912.11 = 658.64/x
  3. Step 3: Cross multiply
    1,275.02x = 1,912.11 × 658.64
  4. Step 4: Simplify right side
    1,275.02x = 1,259,392.13
  5. Step 5: Solve for x
    x = 1,259,392.13/1,275.02
  6. Step 6: Final answer
    x = 987.74

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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.