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Finding the Fourth Proportional to 120,805.60, 181,208.40 and 78,815.20

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Solution

The fourth proportional to 120,805.60, 181,208.40 and 78,815.20 is: 118,222.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,805.60 : 181,208.40 = 78,815.20 : x
  2. Step 2: Convert to fraction form
    120,805.60/181,208.40 = 78,815.20/x
  3. Step 3: Cross multiply
    120,805.60x = 181,208.40 × 78,815.20
  4. Step 4: Simplify right side
    120,805.60x = 14,281,976,287.68
  5. Step 5: Solve for x
    x = 14,281,976,287.68/120,805.60
  6. Step 6: Final answer
    x = 118,222.80

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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.