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Finding the Fourth Proportional to 84,479.67, 126,740.70 and 25,315.20

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Solution

The fourth proportional to 84,479.67, 126,740.70 and 25,315.20 is: 37,979.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,479.67 : 126,740.70 = 25,315.20 : x
  2. Step 2: Convert to fraction form
    84,479.67/126,740.70 = 25,315.20/x
  3. Step 3: Cross multiply
    84,479.67x = 126,740.70 × 25,315.20
  4. Step 4: Simplify right side
    84,479.67x = 3,208,466,168.64
  5. Step 5: Solve for x
    x = 3,208,466,168.64/84,479.67
  6. Step 6: Final answer
    x = 37,979.15

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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.