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Finding the Fourth Proportional to 99,999.80, 149,826.90 and 82,374.20

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Solution

The fourth proportional to 99,999.80, 149,826.90 and 82,374.20 is: 123,418.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,999.80 : 149,826.90 = 82,374.20 : x
  2. Step 2: Convert to fraction form
    99,999.80/149,826.90 = 82,374.20/x
  3. Step 3: Cross multiply
    99,999.80x = 149,826.90 × 82,374.20
  4. Step 4: Simplify right side
    99,999.80x = 12,341,871,025.98
  5. Step 5: Solve for x
    x = 12,341,871,025.98/99,999.80
  6. Step 6: Final answer
    x = 123,418.96

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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.