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Finding the Fourth Proportional to 128,987.91, 177,997.32 and 71,630.86

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Solution

The fourth proportional to 128,987.91, 177,997.32 and 71,630.86 is: 98,847.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,987.91 : 177,997.32 = 71,630.86 : x
  2. Step 2: Convert to fraction form
    128,987.91/177,997.32 = 71,630.86/x
  3. Step 3: Cross multiply
    128,987.91x = 177,997.32 × 71,630.86
  4. Step 4: Simplify right side
    128,987.91x = 12,750,102,045.40
  5. Step 5: Solve for x
    x = 12,750,102,045.40/128,987.91
  6. Step 6: Final answer
    x = 98,847.27

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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.