Home / 128,985.31-177,989.97-72,385.75

Finding the Fourth Proportional to 128,985.31, 177,989.97 and 72,385.75

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Solution

The fourth proportional to 128,985.31, 177,989.97 and 72,385.75 is: 99,886.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,985.31 : 177,989.97 = 72,385.75 : x
  2. Step 2: Convert to fraction form
    128,985.31/177,989.97 = 72,385.75/x
  3. Step 3: Cross multiply
    128,985.31x = 177,989.97 × 72,385.75
  4. Step 4: Simplify right side
    128,985.31x = 12,883,937,470.93
  5. Step 5: Solve for x
    x = 12,883,937,470.93/128,985.31
  6. Step 6: Final answer
    x = 99,886.86

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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.