Home / 128,723.05-177,648.29-71,380.35

Finding the Fourth Proportional to 128,723.05, 177,648.29 and 71,380.35

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Solution

The fourth proportional to 128,723.05, 177,648.29 and 71,380.35 is: 98,510.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,723.05 : 177,648.29 = 71,380.35 : x
  2. Step 2: Convert to fraction form
    128,723.05/177,648.29 = 71,380.35/x
  3. Step 3: Cross multiply
    128,723.05x = 177,648.29 × 71,380.35
  4. Step 4: Simplify right side
    128,723.05x = 12,680,597,117.10
  5. Step 5: Solve for x
    x = 12,680,597,117.10/128,723.05
  6. Step 6: Final answer
    x = 98,510.70

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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.