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Finding the Fourth Proportional to 185.90, 278.50 and 145.20

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Solution

The fourth proportional to 185.90, 278.50 and 145.20 is: 217.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.90 : 278.50 = 145.20 : x
  2. Step 2: Convert to fraction form
    185.90/278.50 = 145.20/x
  3. Step 3: Cross multiply
    185.90x = 278.50 × 145.20
  4. Step 4: Simplify right side
    185.90x = 40,438.20
  5. Step 5: Solve for x
    x = 40,438.20/185.90
  6. Step 6: Final answer
    x = 217.53

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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.