Home / 120,120.31-180,244.64-77,990.41

Finding the Fourth Proportional to 120,120.31, 180,244.64 and 77,990.41

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Solution

The fourth proportional to 120,120.31, 180,244.64 and 77,990.41 is: 117,027.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,120.31 : 180,244.64 = 77,990.41 : x
  2. Step 2: Convert to fraction form
    120,120.31/180,244.64 = 77,990.41/x
  3. Step 3: Cross multiply
    120,120.31x = 180,244.64 × 77,990.41
  4. Step 4: Simplify right side
    120,120.31x = 14,057,353,373.90
  5. Step 5: Solve for x
    x = 14,057,353,373.90/120,120.31
  6. Step 6: Final answer
    x = 117,027.28

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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.