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Finding the Fourth Proportional to 40,079, 60,128.40 and 12,377

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Solution

The fourth proportional to 40,079, 60,128.40 and 12,377 is: 18,568.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,079 : 60,128.40 = 12,377 : x
  2. Step 2: Convert to fraction form
    40,079/60,128.40 = 12,377/x
  3. Step 3: Cross multiply
    40,079x = 60,128.40 × 12,377
  4. Step 4: Simplify right side
    40,079x = 744,209,206.80
  5. Step 5: Solve for x
    x = 744,209,206.80/40,079
  6. Step 6: Final answer
    x = 18,568.56

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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.