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Finding the Fourth Proportional to 1,242.84, 1,865.25 and 658.47

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Solution

The fourth proportional to 1,242.84, 1,865.25 and 658.47 is: 988.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.84 : 1,865.25 = 658.47 : x
  2. Step 2: Convert to fraction form
    1,242.84/1,865.25 = 658.47/x
  3. Step 3: Cross multiply
    1,242.84x = 1,865.25 × 658.47
  4. Step 4: Simplify right side
    1,242.84x = 1,228,211.17
  5. Step 5: Solve for x
    x = 1,228,211.17/1,242.84
  6. Step 6: Final answer
    x = 988.23

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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.