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Finding the Fourth Proportional to 231,319.40, 346,979.10 and 81,728.60

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Solution

The fourth proportional to 231,319.40, 346,979.10 and 81,728.60 is: 122,592.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,319.40 : 346,979.10 = 81,728.60 : x
  2. Step 2: Convert to fraction form
    231,319.40/346,979.10 = 81,728.60/x
  3. Step 3: Cross multiply
    231,319.40x = 346,979.10 × 81,728.60
  4. Step 4: Simplify right side
    231,319.40x = 28,358,116,072.26
  5. Step 5: Solve for x
    x = 28,358,116,072.26/231,319.40
  6. Step 6: Final answer
    x = 122,592.90

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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.