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Finding the Fourth Proportional to 218.78, 302.02 and 145.24

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Solution

The fourth proportional to 218.78, 302.02 and 145.24 is: 200.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.78 : 302.02 = 145.24 : x
  2. Step 2: Convert to fraction form
    218.78/302.02 = 145.24/x
  3. Step 3: Cross multiply
    218.78x = 302.02 × 145.24
  4. Step 4: Simplify right side
    218.78x = 43,865.38
  5. Step 5: Solve for x
    x = 43,865.38/218.78
  6. Step 6: Final answer
    x = 200.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.