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Finding the Fourth Proportional to 1,279.10, 1,915.40 and 1,060.40

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Solution

The fourth proportional to 1,279.10, 1,915.40 and 1,060.40 is: 1,587.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.10 : 1,915.40 = 1,060.40 : x
  2. Step 2: Convert to fraction form
    1,279.10/1,915.40 = 1,060.40/x
  3. Step 3: Cross multiply
    1,279.10x = 1,915.40 × 1,060.40
  4. Step 4: Simplify right side
    1,279.10x = 2,031,090.16
  5. Step 5: Solve for x
    x = 2,031,090.16/1,279.10
  6. Step 6: Final answer
    x = 1,587.91

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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.