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Finding the Fourth Proportional to 128,920.56, 177,910.20 and 72,337.20

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Solution

The fourth proportional to 128,920.56, 177,910.20 and 72,337.20 is: 99,825.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,920.56 : 177,910.20 = 72,337.20 : x
  2. Step 2: Convert to fraction form
    128,920.56/177,910.20 = 72,337.20/x
  3. Step 3: Cross multiply
    128,920.56x = 177,910.20 × 72,337.20
  4. Step 4: Simplify right side
    128,920.56x = 12,869,525,719.44
  5. Step 5: Solve for x
    x = 12,869,525,719.44/128,920.56
  6. Step 6: Final answer
    x = 99,825.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.