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Finding the Fourth Proportional to 258,310.81, 387,459.05 and 68,772.81

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Solution

The fourth proportional to 258,310.81, 387,459.05 and 68,772.81 is: 103,157.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,310.81 : 387,459.05 = 68,772.81 : x
  2. Step 2: Convert to fraction form
    258,310.81/387,459.05 = 68,772.81/x
  3. Step 3: Cross multiply
    258,310.81x = 387,459.05 × 68,772.81
  4. Step 4: Simplify right side
    258,310.81x = 26,646,645,691.14
  5. Step 5: Solve for x
    x = 26,646,645,691.14/258,310.81
  6. Step 6: Final answer
    x = 103,157.30

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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.