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Finding the Fourth Proportional to 121,405.60, 182,108.40 and 79,415.20

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Solution

The fourth proportional to 121,405.60, 182,108.40 and 79,415.20 is: 119,122.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,405.60 : 182,108.40 = 79,415.20 : x
  2. Step 2: Convert to fraction form
    121,405.60/182,108.40 = 79,415.20/x
  3. Step 3: Cross multiply
    121,405.60x = 182,108.40 × 79,415.20
  4. Step 4: Simplify right side
    121,405.60x = 14,462,175,007.68
  5. Step 5: Solve for x
    x = 14,462,175,007.68/121,405.60
  6. Step 6: Final answer
    x = 119,122.80

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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.