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Finding the Fourth Proportional to 84,871.60, 127,321.16 and 28,715.12

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Solution

The fourth proportional to 84,871.60, 127,321.16 and 28,715.12 is: 43,077.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,871.60 : 127,321.16 = 28,715.12 : x
  2. Step 2: Convert to fraction form
    84,871.60/127,321.16 = 28,715.12/x
  3. Step 3: Cross multiply
    84,871.60x = 127,321.16 × 28,715.12
  4. Step 4: Simplify right side
    84,871.60x = 3,656,042,387.94
  5. Step 5: Solve for x
    x = 3,656,042,387.94/84,871.60
  6. Step 6: Final answer
    x = 43,077.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.