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Finding the Fourth Proportional to 128,987.85, 177,997.24 and 71,630.80

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Solution

The fourth proportional to 128,987.85, 177,997.24 and 71,630.80 is: 98,847.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,987.85 : 177,997.24 = 71,630.80 : x
  2. Step 2: Convert to fraction form
    128,987.85/177,997.24 = 71,630.80/x
  3. Step 3: Cross multiply
    128,987.85x = 177,997.24 × 71,630.80
  4. Step 4: Simplify right side
    128,987.85x = 12,750,084,340.84
  5. Step 5: Solve for x
    x = 12,750,084,340.84/128,987.85
  6. Step 6: Final answer
    x = 98,847.18

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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.