Home / 128,912.40-177,899.76-72,324.18

Finding the Fourth Proportional to 128,912.40, 177,899.76 and 72,324.18

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Solution

The fourth proportional to 128,912.40, 177,899.76 and 72,324.18 is: 99,807.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,912.40 : 177,899.76 = 72,324.18 : x
  2. Step 2: Convert to fraction form
    128,912.40/177,899.76 = 72,324.18/x
  3. Step 3: Cross multiply
    128,912.40x = 177,899.76 × 72,324.18
  4. Step 4: Simplify right side
    128,912.40x = 12,866,454,264.20
  5. Step 5: Solve for x
    x = 12,866,454,264.20/128,912.40
  6. Step 6: Final answer
    x = 99,807.73

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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.