Home / 128,320.40-177,082.61-71,731.78

Finding the Fourth Proportional to 128,320.40, 177,082.61 and 71,731.78

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Solution

The fourth proportional to 128,320.40, 177,082.61 and 71,731.78 is: 98,990.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,320.40 : 177,082.61 = 71,731.78 : x
  2. Step 2: Convert to fraction form
    128,320.40/177,082.61 = 71,731.78/x
  3. Step 3: Cross multiply
    128,320.40x = 177,082.61 × 71,731.78
  4. Step 4: Simplify right side
    128,320.40x = 12,702,450,020.98
  5. Step 5: Solve for x
    x = 12,702,450,020.98/128,320.40
  6. Step 6: Final answer
    x = 98,990.10

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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.