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Finding the Fourth Proportional to 278,990.70, 385,002.62 and 151,669.50

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Solution

The fourth proportional to 278,990.70, 385,002.62 and 151,669.50 is: 209,301.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,990.70 : 385,002.62 = 151,669.50 : x
  2. Step 2: Convert to fraction form
    278,990.70/385,002.62 = 151,669.50/x
  3. Step 3: Cross multiply
    278,990.70x = 385,002.62 × 151,669.50
  4. Step 4: Simplify right side
    278,990.70x = 58,393,154,874.09
  5. Step 5: Solve for x
    x = 58,393,154,874.09/278,990.70
  6. Step 6: Final answer
    x = 209,301.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.