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Finding the Fourth Proportional to 128,292.71, 177,040.88 and 71,709.35

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Solution

The fourth proportional to 128,292.71, 177,040.88 and 71,709.35 is: 98,957.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,292.71 : 177,040.88 = 71,709.35 : x
  2. Step 2: Convert to fraction form
    128,292.71/177,040.88 = 71,709.35/x
  3. Step 3: Cross multiply
    128,292.71x = 177,040.88 × 71,709.35
  4. Step 4: Simplify right side
    128,292.71x = 12,695,486,069.68
  5. Step 5: Solve for x
    x = 12,695,486,069.68/128,292.71
  6. Step 6: Final answer
    x = 98,957.19

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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.