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Finding the Fourth Proportional to 128,572.80, 177,428.48 and 71,986.24

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Solution

The fourth proportional to 128,572.80, 177,428.48 and 71,986.24 is: 99,339.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,572.80 : 177,428.48 = 71,986.24 : x
  2. Step 2: Convert to fraction form
    128,572.80/177,428.48 = 71,986.24/x
  3. Step 3: Cross multiply
    128,572.80x = 177,428.48 × 71,986.24
  4. Step 4: Simplify right side
    128,572.80x = 12,772,409,144.12
  5. Step 5: Solve for x
    x = 12,772,409,144.12/128,572.80
  6. Step 6: Final answer
    x = 99,339.90

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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.