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Finding the Fourth Proportional to 81,405.40, 122,108.10 and 67,581.40

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Solution

The fourth proportional to 81,405.40, 122,108.10 and 67,581.40 is: 101,372.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,405.40 : 122,108.10 = 67,581.40 : x
  2. Step 2: Convert to fraction form
    81,405.40/122,108.10 = 67,581.40/x
  3. Step 3: Cross multiply
    81,405.40x = 122,108.10 × 67,581.40
  4. Step 4: Simplify right side
    81,405.40x = 8,252,236,349.34
  5. Step 5: Solve for x
    x = 8,252,236,349.34/81,405.40
  6. Step 6: Final answer
    x = 101,372.10

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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.