Home / 128,520.18-177,357.82-71,931.55

Finding the Fourth Proportional to 128,520.18, 177,357.82 and 71,931.55

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Solution

The fourth proportional to 128,520.18, 177,357.82 and 71,931.55 is: 99,265.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,520.18 : 177,357.82 = 71,931.55 : x
  2. Step 2: Convert to fraction form
    128,520.18/177,357.82 = 71,931.55/x
  3. Step 3: Cross multiply
    128,520.18x = 177,357.82 × 71,931.55
  4. Step 4: Simplify right side
    128,520.18x = 12,757,622,537.56
  5. Step 5: Solve for x
    x = 12,757,622,537.56/128,520.18
  6. Step 6: Final answer
    x = 99,265.52

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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.