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Finding the Fourth Proportional to 213.59, 320.11 and 145.55

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Solution

The fourth proportional to 213.59, 320.11 and 145.55 is: 218.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.59 : 320.11 = 145.55 : x
  2. Step 2: Convert to fraction form
    213.59/320.11 = 145.55/x
  3. Step 3: Cross multiply
    213.59x = 320.11 × 145.55
  4. Step 4: Simplify right side
    213.59x = 46,592.01
  5. Step 5: Solve for x
    x = 46,592.01/213.59
  6. Step 6: Final answer
    x = 218.14

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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.