Home / 128,790.18-177,713.52-71,428.82

Finding the Fourth Proportional to 128,790.18, 177,713.52 and 71,428.82

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Solution

The fourth proportional to 128,790.18, 177,713.52 and 71,428.82 is: 98,562.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,790.18 : 177,713.52 = 71,428.82 : x
  2. Step 2: Convert to fraction form
    128,790.18/177,713.52 = 71,428.82/x
  3. Step 3: Cross multiply
    128,790.18x = 177,713.52 × 71,428.82
  4. Step 4: Simplify right side
    128,790.18x = 12,693,867,031.65
  5. Step 5: Solve for x
    x = 12,693,867,031.65/128,790.18
  6. Step 6: Final answer
    x = 98,562.38

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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.