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Finding the Fourth Proportional to 128,520.64, 177,346.17 and 71,157.86

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Solution

The fourth proportional to 128,520.64, 177,346.17 and 71,157.86 is: 98,191.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,520.64 : 177,346.17 = 71,157.86 : x
  2. Step 2: Convert to fraction form
    128,520.64/177,346.17 = 71,157.86/x
  3. Step 3: Cross multiply
    128,520.64x = 177,346.17 × 71,157.86
  4. Step 4: Simplify right side
    128,520.64x = 12,619,574,213.50
  5. Step 5: Solve for x
    x = 12,619,574,213.50/128,520.64
  6. Step 6: Final answer
    x = 98,191.03

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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.