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Finding the Fourth Proportional to 128,820, 177,711.12 and 91,115.04

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Solution

The fourth proportional to 128,820, 177,711.12 and 91,115.04 is: 125,695.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,820 : 177,711.12 = 91,115.04 : x
  2. Step 2: Convert to fraction form
    128,820/177,711.12 = 91,115.04/x
  3. Step 3: Cross multiply
    128,820x = 177,711.12 × 91,115.04
  4. Step 4: Simplify right side
    128,820x = 16,192,155,807.24
  5. Step 5: Solve for x
    x = 16,192,155,807.24/128,820
  6. Step 6: Final answer
    x = 125,695.98

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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.