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Finding the Fourth Proportional to 128,378.64, 177,159.21 and 71,016.48

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Solution

The fourth proportional to 128,378.64, 177,159.21 and 71,016.48 is: 98,000.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,378.64 : 177,159.21 = 71,016.48 : x
  2. Step 2: Convert to fraction form
    128,378.64/177,159.21 = 71,016.48/x
  3. Step 3: Cross multiply
    128,378.64x = 177,159.21 × 71,016.48
  4. Step 4: Simplify right side
    128,378.64x = 12,581,223,493.78
  5. Step 5: Solve for x
    x = 12,581,223,493.78/128,378.64
  6. Step 6: Final answer
    x = 98,000.91

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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.