Home / 128,639.72-177,531-72,054.56

Finding the Fourth Proportional to 128,639.72, 177,531 and 72,054.56

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Solution

The fourth proportional to 128,639.72, 177,531 and 72,054.56 is: 99,439.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,639.72 : 177,531 = 72,054.56 : x
  2. Step 2: Convert to fraction form
    128,639.72/177,531 = 72,054.56/x
  3. Step 3: Cross multiply
    128,639.72x = 177,531 × 72,054.56
  4. Step 4: Simplify right side
    128,639.72x = 12,791,918,091.36
  5. Step 5: Solve for x
    x = 12,791,918,091.36/128,639.72
  6. Step 6: Final answer
    x = 99,439.88

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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.