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Finding the Fourth Proportional to 102,654.80, 153,982.20 and 87,621.20

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Solution

The fourth proportional to 102,654.80, 153,982.20 and 87,621.20 is: 131,431.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,654.80 : 153,982.20 = 87,621.20 : x
  2. Step 2: Convert to fraction form
    102,654.80/153,982.20 = 87,621.20/x
  3. Step 3: Cross multiply
    102,654.80x = 153,982.20 × 87,621.20
  4. Step 4: Simplify right side
    102,654.80x = 13,492,105,142.64
  5. Step 5: Solve for x
    x = 13,492,105,142.64/102,654.80
  6. Step 6: Final answer
    x = 131,431.80

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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.