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Finding the Fourth Proportional to 1,294.11, 1,938.74 and 645.30

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Solution

The fourth proportional to 1,294.11, 1,938.74 and 645.30 is: 966.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.11 : 1,938.74 = 645.30 : x
  2. Step 2: Convert to fraction form
    1,294.11/1,938.74 = 645.30/x
  3. Step 3: Cross multiply
    1,294.11x = 1,938.74 × 645.30
  4. Step 4: Simplify right side
    1,294.11x = 1,251,065.70
  5. Step 5: Solve for x
    x = 1,251,065.70/1,294.11
  6. Step 6: Final answer
    x = 966.74

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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.