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Finding the Fourth Proportional to 80,781.80, 121,242.72 and 80,595

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Solution

The fourth proportional to 80,781.80, 121,242.72 and 80,595 is: 120,962.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,781.80 : 121,242.72 = 80,595 : x
  2. Step 2: Convert to fraction form
    80,781.80/121,242.72 = 80,595/x
  3. Step 3: Cross multiply
    80,781.80x = 121,242.72 × 80,595
  4. Step 4: Simplify right side
    80,781.80x = 9,771,557,018.40
  5. Step 5: Solve for x
    x = 9,771,557,018.40/80,781.80
  6. Step 6: Final answer
    x = 120,962.36

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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.