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Finding the Fourth Proportional to 278,439.40, 417,788.70 and 145,469.80

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Solution

The fourth proportional to 278,439.40, 417,788.70 and 145,469.80 is: 218,272.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,439.40 : 417,788.70 = 145,469.80 : x
  2. Step 2: Convert to fraction form
    278,439.40/417,788.70 = 145,469.80/x
  3. Step 3: Cross multiply
    278,439.40x = 417,788.70 × 145,469.80
  4. Step 4: Simplify right side
    278,439.40x = 60,775,638,631.26
  5. Step 5: Solve for x
    x = 60,775,638,631.26/278,439.40
  6. Step 6: Final answer
    x = 218,272.41

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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.