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Finding the Fourth Proportional to 278.03, 416.54 and 115.43

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Solution

The fourth proportional to 278.03, 416.54 and 115.43 is: 172.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.03 : 416.54 = 115.43 : x
  2. Step 2: Convert to fraction form
    278.03/416.54 = 115.43/x
  3. Step 3: Cross multiply
    278.03x = 416.54 × 115.43
  4. Step 4: Simplify right side
    278.03x = 48,079.42
  5. Step 5: Solve for x
    x = 48,079.42/278.03
  6. Step 6: Final answer
    x = 172.93

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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.