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Finding the Fourth Proportional to 243.64, 365.28 and 145.90

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Solution

The fourth proportional to 243.64, 365.28 and 145.90 is: 218.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.64 : 365.28 = 145.90 : x
  2. Step 2: Convert to fraction form
    243.64/365.28 = 145.90/x
  3. Step 3: Cross multiply
    243.64x = 365.28 × 145.90
  4. Step 4: Simplify right side
    243.64x = 53,294.35
  5. Step 5: Solve for x
    x = 53,294.35/243.64
  6. Step 6: Final answer
    x = 218.74

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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.