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Finding the Fourth Proportional to 121,276.80, 181,915.20 and 79,286.40

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Solution

The fourth proportional to 121,276.80, 181,915.20 and 79,286.40 is: 118,929.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,276.80 : 181,915.20 = 79,286.40 : x
  2. Step 2: Convert to fraction form
    121,276.80/181,915.20 = 79,286.40/x
  3. Step 3: Cross multiply
    121,276.80x = 181,915.20 × 79,286.40
  4. Step 4: Simplify right side
    121,276.80x = 14,423,401,313.28
  5. Step 5: Solve for x
    x = 14,423,401,313.28/121,276.80
  6. Step 6: Final answer
    x = 118,929.60

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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.