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Finding the Fourth Proportional to 219.61, 302.82 and 145.78

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Solution

The fourth proportional to 219.61, 302.82 and 145.78 is: 201.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.61 : 302.82 = 145.78 : x
  2. Step 2: Convert to fraction form
    219.61/302.82 = 145.78/x
  3. Step 3: Cross multiply
    219.61x = 302.82 × 145.78
  4. Step 4: Simplify right side
    219.61x = 44,145.10
  5. Step 5: Solve for x
    x = 44,145.10/219.61
  6. Step 6: Final answer
    x = 201.02

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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.