Home / 12,915.78-19,377.34-6,679.20

Finding the Fourth Proportional to 12,915.78, 19,377.34 and 6,679.20

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Solution

The fourth proportional to 12,915.78, 19,377.34 and 6,679.20 is: 10,020.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.78 : 19,377.34 = 6,679.20 : x
  2. Step 2: Convert to fraction form
    12,915.78/19,377.34 = 6,679.20/x
  3. Step 3: Cross multiply
    12,915.78x = 19,377.34 × 6,679.20
  4. Step 4: Simplify right side
    12,915.78x = 129,425,129.33
  5. Step 5: Solve for x
    x = 129,425,129.33/12,915.78
  6. Step 6: Final answer
    x = 10,020.70

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1.5x scale

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.