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Finding the Fourth Proportional to 128,955.38, 177,966.32 and 72,366.75

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Solution

The fourth proportional to 128,955.38, 177,966.32 and 72,366.75 is: 99,870.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,955.38 : 177,966.32 = 72,366.75 : x
  2. Step 2: Convert to fraction form
    128,955.38/177,966.32 = 72,366.75/x
  3. Step 3: Cross multiply
    128,955.38x = 177,966.32 × 72,366.75
  4. Step 4: Simplify right side
    128,955.38x = 12,878,843,826.03
  5. Step 5: Solve for x
    x = 12,878,843,826.03/128,955.38
  6. Step 6: Final answer
    x = 99,870.55

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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.