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Finding the Fourth Proportional to 258,616.20, 387,419.90 and 145,955.62

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Solution

The fourth proportional to 258,616.20, 387,419.90 and 145,955.62 is: 218,648.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,616.20 : 387,419.90 = 145,955.62 : x
  2. Step 2: Convert to fraction form
    258,616.20/387,419.90 = 145,955.62/x
  3. Step 3: Cross multiply
    258,616.20x = 387,419.90 × 145,955.62
  4. Step 4: Simplify right side
    258,616.20x = 56,546,111,704.84
  5. Step 5: Solve for x
    x = 56,546,111,704.84/258,616.20
  6. Step 6: Final answer
    x = 218,648.76

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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.