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Finding the Fourth Proportional to 121,409.60, 182,114.40 and 79,419.20

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Solution

The fourth proportional to 121,409.60, 182,114.40 and 79,419.20 is: 119,128.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,409.60 : 182,114.40 = 79,419.20 : x
  2. Step 2: Convert to fraction form
    121,409.60/182,114.40 = 79,419.20/x
  3. Step 3: Cross multiply
    121,409.60x = 182,114.40 × 79,419.20
  4. Step 4: Simplify right side
    121,409.60x = 14,463,379,956.48
  5. Step 5: Solve for x
    x = 14,463,379,956.48/121,409.60
  6. Step 6: Final answer
    x = 119,128.80

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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.