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Finding the Fourth Proportional to 127,980, 176,612.40 and 71,391.38

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Solution

The fourth proportional to 127,980, 176,612.40 and 71,391.38 is: 98,520.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,980 : 176,612.40 = 71,391.38 : x
  2. Step 2: Convert to fraction form
    127,980/176,612.40 = 71,391.38/x
  3. Step 3: Cross multiply
    127,980x = 176,612.40 × 71,391.38
  4. Step 4: Simplify right side
    127,980x = 12,608,602,078.05
  5. Step 5: Solve for x
    x = 12,608,602,078.05/127,980
  6. Step 6: Final answer
    x = 98,520.10

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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.