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Finding the Fourth Proportional to 80,412.80, 120,424.80 and 76,913.60

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Solution

The fourth proportional to 80,412.80, 120,424.80 and 76,913.60 is: 115,184.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,412.80 : 120,424.80 = 76,913.60 : x
  2. Step 2: Convert to fraction form
    80,412.80/120,424.80 = 76,913.60/x
  3. Step 3: Cross multiply
    80,412.80x = 120,424.80 × 76,913.60
  4. Step 4: Simplify right side
    80,412.80x = 9,262,304,897.28
  5. Step 5: Solve for x
    x = 9,262,304,897.28/80,412.80
  6. Step 6: Final answer
    x = 115,184.46

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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.