Home / 120,660.36-180,755.10-78,981

Finding the Fourth Proportional to 120,660.36, 180,755.10 and 78,981

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Solution

The fourth proportional to 120,660.36, 180,755.10 and 78,981 is: 118,317.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,660.36 : 180,755.10 = 78,981 : x
  2. Step 2: Convert to fraction form
    120,660.36/180,755.10 = 78,981/x
  3. Step 3: Cross multiply
    120,660.36x = 180,755.10 × 78,981
  4. Step 4: Simplify right side
    120,660.36x = 14,276,218,553.10
  5. Step 5: Solve for x
    x = 14,276,218,553.10/120,660.36
  6. Step 6: Final answer
    x = 118,317.39

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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.