Home / 12,915.20-19,358.40-6,672.80

Finding the Fourth Proportional to 12,915.20, 19,358.40 and 6,672.80

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Solution

The fourth proportional to 12,915.20, 19,358.40 and 6,672.80 is: 10,001.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.20 : 19,358.40 = 6,672.80 : x
  2. Step 2: Convert to fraction form
    12,915.20/19,358.40 = 6,672.80/x
  3. Step 3: Cross multiply
    12,915.20x = 19,358.40 × 6,672.80
  4. Step 4: Simplify right side
    12,915.20x = 129,174,731.52
  5. Step 5: Solve for x
    x = 129,174,731.52/12,915.20
  6. Step 6: Final answer
    x = 10,001.76

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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.