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Finding the Fourth Proportional to 128,572.06, 177,425.52 and 71,209.11

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Solution

The fourth proportional to 128,572.06, 177,425.52 and 71,209.11 is: 98,266.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,572.06 : 177,425.52 = 71,209.11 : x
  2. Step 2: Convert to fraction form
    128,572.06/177,425.52 = 71,209.11/x
  3. Step 3: Cross multiply
    128,572.06x = 177,425.52 × 71,209.11
  4. Step 4: Simplify right side
    128,572.06x = 12,634,313,370.49
  5. Step 5: Solve for x
    x = 12,634,313,370.49/128,572.06
  6. Step 6: Final answer
    x = 98,266.40

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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.