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Finding the Fourth Proportional to 118,821.60, 178,270.80 and 79,423.20

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Solution

The fourth proportional to 118,821.60, 178,270.80 and 79,423.20 is: 119,160.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,821.60 : 178,270.80 = 79,423.20 : x
  2. Step 2: Convert to fraction form
    118,821.60/178,270.80 = 79,423.20/x
  3. Step 3: Cross multiply
    118,821.60x = 178,270.80 × 79,423.20
  4. Step 4: Simplify right side
    118,821.60x = 14,158,837,402.56
  5. Step 5: Solve for x
    x = 14,158,837,402.56/118,821.60
  6. Step 6: Final answer
    x = 119,160.47

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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.