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Finding the Fourth Proportional to 120,485.70, 180,728.55 and 92,492.10

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Solution

The fourth proportional to 120,485.70, 180,728.55 and 92,492.10 is: 138,738.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,485.70 : 180,728.55 = 92,492.10 : x
  2. Step 2: Convert to fraction form
    120,485.70/180,728.55 = 92,492.10/x
  3. Step 3: Cross multiply
    120,485.70x = 180,728.55 × 92,492.10
  4. Step 4: Simplify right side
    120,485.70x = 16,715,963,119.46
  5. Step 5: Solve for x
    x = 16,715,963,119.46/120,485.70
  6. Step 6: Final answer
    x = 138,738.15

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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.