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Finding the Fourth Proportional to 84,690.96, 126,990.96 and 28,512.40

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Solution

The fourth proportional to 84,690.96, 126,990.96 and 28,512.40 is: 42,753.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,690.96 : 126,990.96 = 28,512.40 : x
  2. Step 2: Convert to fraction form
    84,690.96/126,990.96 = 28,512.40/x
  3. Step 3: Cross multiply
    84,690.96x = 126,990.96 × 28,512.40
  4. Step 4: Simplify right side
    84,690.96x = 3,620,817,047.90
  5. Step 5: Solve for x
    x = 3,620,817,047.90/84,690.96
  6. Step 6: Final answer
    x = 42,753.29

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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.