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Finding the Fourth Proportional to 118,948.64, 178,420.50 and 28,991.87

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Solution

The fourth proportional to 118,948.64, 178,420.50 and 28,991.87 is: 43,487.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,948.64 : 178,420.50 = 28,991.87 : x
  2. Step 2: Convert to fraction form
    118,948.64/178,420.50 = 28,991.87/x
  3. Step 3: Cross multiply
    118,948.64x = 178,420.50 × 28,991.87
  4. Step 4: Simplify right side
    118,948.64x = 5,172,743,049.23
  5. Step 5: Solve for x
    x = 5,172,743,049.23/118,948.64
  6. Step 6: Final answer
    x = 43,487.20

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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.