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Finding the Fourth Proportional to 128,281.80, 177,029.15 and 71,693.18

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Solution

The fourth proportional to 128,281.80, 177,029.15 and 71,693.18 is: 98,936.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,281.80 : 177,029.15 = 71,693.18 : x
  2. Step 2: Convert to fraction form
    128,281.80/177,029.15 = 71,693.18/x
  3. Step 3: Cross multiply
    128,281.80x = 177,029.15 × 71,693.18
  4. Step 4: Simplify right side
    128,281.80x = 12,691,782,716.20
  5. Step 5: Solve for x
    x = 12,691,782,716.20/128,281.80
  6. Step 6: Final answer
    x = 98,936.74

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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.