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Finding the Fourth Proportional to 407.95, 611.85 and 147.90

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Solution

The fourth proportional to 407.95, 611.85 and 147.90 is: 221.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.95 : 611.85 = 147.90 : x
  2. Step 2: Convert to fraction form
    407.95/611.85 = 147.90/x
  3. Step 3: Cross multiply
    407.95x = 611.85 × 147.90
  4. Step 4: Simplify right side
    407.95x = 90,492.62
  5. Step 5: Solve for x
    x = 90,492.62/407.95
  6. Step 6: Final answer
    x = 221.82

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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.