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Finding the Fourth Proportional to 80,999.65, 121,499.48 and 78,812.65

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Solution

The fourth proportional to 80,999.65, 121,499.48 and 78,812.65 is: 118,218.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,999.65 : 121,499.48 = 78,812.65 : x
  2. Step 2: Convert to fraction form
    80,999.65/121,499.48 = 78,812.65/x
  3. Step 3: Cross multiply
    80,999.65x = 121,499.48 × 78,812.65
  4. Step 4: Simplify right side
    80,999.65x = 9,575,695,992.42
  5. Step 5: Solve for x
    x = 9,575,695,992.42/80,999.65
  6. Step 6: Final answer
    x = 118,218.98

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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.