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Finding the Fourth Proportional to 84,689.52, 127,311.36 and 78,478.56

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Solution

The fourth proportional to 84,689.52, 127,311.36 and 78,478.56 is: 117,974.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,689.52 : 127,311.36 = 78,478.56 : x
  2. Step 2: Convert to fraction form
    84,689.52/127,311.36 = 78,478.56/x
  3. Step 3: Cross multiply
    84,689.52x = 127,311.36 × 78,478.56
  4. Step 4: Simplify right side
    84,689.52x = 9,991,212,204.44
  5. Step 5: Solve for x
    x = 9,991,212,204.44/84,689.52
  6. Step 6: Final answer
    x = 117,974.60

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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.