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Finding the Fourth Proportional to 84,612.60, 126,918.90 and 21,432.60

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Solution

The fourth proportional to 84,612.60, 126,918.90 and 21,432.60 is: 32,148.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,612.60 : 126,918.90 = 21,432.60 : x
  2. Step 2: Convert to fraction form
    84,612.60/126,918.90 = 21,432.60/x
  3. Step 3: Cross multiply
    84,612.60x = 126,918.90 × 21,432.60
  4. Step 4: Simplify right side
    84,612.60x = 2,720,202,016.14
  5. Step 5: Solve for x
    x = 2,720,202,016.14/84,612.60
  6. Step 6: Final answer
    x = 32,148.90

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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.