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Finding the Fourth Proportional to 219.28, 302.42 and 145.70

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Solution

The fourth proportional to 219.28, 302.42 and 145.70 is: 200.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.28 : 302.42 = 145.70 : x
  2. Step 2: Convert to fraction form
    219.28/302.42 = 145.70/x
  3. Step 3: Cross multiply
    219.28x = 302.42 × 145.70
  4. Step 4: Simplify right side
    219.28x = 44,062.59
  5. Step 5: Solve for x
    x = 44,062.59/219.28
  6. Step 6: Final answer
    x = 200.94

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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.