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Finding the Fourth Proportional to 120,872.80, 181,309.20 and 78,882.40

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Solution

The fourth proportional to 120,872.80, 181,309.20 and 78,882.40 is: 118,323.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,872.80 : 181,309.20 = 78,882.40 : x
  2. Step 2: Convert to fraction form
    120,872.80/181,309.20 = 78,882.40/x
  3. Step 3: Cross multiply
    120,872.80x = 181,309.20 × 78,882.40
  4. Step 4: Simplify right side
    120,872.80x = 14,302,104,838.08
  5. Step 5: Solve for x
    x = 14,302,104,838.08/120,872.80
  6. Step 6: Final answer
    x = 118,323.60

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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.