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Finding the Fourth Proportional to 128,275.85, 177,020.24 and 71,687.23

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Solution

The fourth proportional to 128,275.85, 177,020.24 and 71,687.23 is: 98,928.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,275.85 : 177,020.24 = 71,687.23 : x
  2. Step 2: Convert to fraction form
    128,275.85/177,020.24 = 71,687.23/x
  3. Step 3: Cross multiply
    128,275.85x = 177,020.24 × 71,687.23
  4. Step 4: Simplify right side
    128,275.85x = 12,690,089,858.55
  5. Step 5: Solve for x
    x = 12,690,089,858.55/128,275.85
  6. Step 6: Final answer
    x = 98,928.13

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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.