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Finding the Fourth Proportional to 1,307.98, 1,960.86 and 614.28

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Solution

The fourth proportional to 1,307.98, 1,960.86 and 614.28 is: 920.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.98 : 1,960.86 = 614.28 : x
  2. Step 2: Convert to fraction form
    1,307.98/1,960.86 = 614.28/x
  3. Step 3: Cross multiply
    1,307.98x = 1,960.86 × 614.28
  4. Step 4: Simplify right side
    1,307.98x = 1,204,517.08
  5. Step 5: Solve for x
    x = 1,204,517.08/1,307.98
  6. Step 6: Final answer
    x = 920.90

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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.