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Finding the Fourth Proportional to 121,279.80, 181,919.70 and 79,289.40

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Solution

The fourth proportional to 121,279.80, 181,919.70 and 79,289.40 is: 118,934.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,279.80 : 181,919.70 = 79,289.40 : x
  2. Step 2: Convert to fraction form
    121,279.80/181,919.70 = 79,289.40/x
  3. Step 3: Cross multiply
    121,279.80x = 181,919.70 × 79,289.40
  4. Step 4: Simplify right side
    121,279.80x = 14,424,303,861.18
  5. Step 5: Solve for x
    x = 14,424,303,861.18/121,279.80
  6. Step 6: Final answer
    x = 118,934.10

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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.