Home / 128,947.24-177,966.18-78,675.40

Finding the Fourth Proportional to 128,947.24, 177,966.18 and 78,675.40

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Solution

The fourth proportional to 128,947.24, 177,966.18 and 78,675.40 is: 108,583.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,947.24 : 177,966.18 = 78,675.40 : x
  2. Step 2: Convert to fraction form
    128,947.24/177,966.18 = 78,675.40/x
  3. Step 3: Cross multiply
    128,947.24x = 177,966.18 × 78,675.40
  4. Step 4: Simplify right side
    128,947.24x = 14,001,560,397.97
  5. Step 5: Solve for x
    x = 14,001,560,397.97/128,947.24
  6. Step 6: Final answer
    x = 108,583.64

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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.