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Finding the Fourth Proportional to 128,519.92, 177,459.48 and 85,540.72

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Solution

The fourth proportional to 128,519.92, 177,459.48 and 85,540.72 is: 118,114.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,519.92 : 177,459.48 = 85,540.72 : x
  2. Step 2: Convert to fraction form
    128,519.92/177,459.48 = 85,540.72/x
  3. Step 3: Cross multiply
    128,519.92x = 177,459.48 × 85,540.72
  4. Step 4: Simplify right side
    128,519.92x = 15,180,011,690.03
  5. Step 5: Solve for x
    x = 15,180,011,690.03/128,519.92
  6. Step 6: Final answer
    x = 118,114.08

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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.