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Finding the Fourth Proportional to 278.18, 416.53 and 147.91

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Solution

The fourth proportional to 278.18, 416.53 and 147.91 is: 221.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.18 : 416.53 = 147.91 : x
  2. Step 2: Convert to fraction form
    278.18/416.53 = 147.91/x
  3. Step 3: Cross multiply
    278.18x = 416.53 × 147.91
  4. Step 4: Simplify right side
    278.18x = 61,608.95
  5. Step 5: Solve for x
    x = 61,608.95/278.18
  6. Step 6: Final answer
    x = 221.47

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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.