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Finding the Fourth Proportional to 1,279.93, 1,914.85 and 915.61

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Solution

The fourth proportional to 1,279.93, 1,914.85 and 915.61 is: 1,369.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.93 : 1,914.85 = 915.61 : x
  2. Step 2: Convert to fraction form
    1,279.93/1,914.85 = 915.61/x
  3. Step 3: Cross multiply
    1,279.93x = 1,914.85 × 915.61
  4. Step 4: Simplify right side
    1,279.93x = 1,753,255.81
  5. Step 5: Solve for x
    x = 1,753,255.81/1,279.93
  6. Step 6: Final answer
    x = 1,369.81

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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.