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Finding the Fourth Proportional to 147, 219.39 and 145.56

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Solution

The fourth proportional to 147, 219.39 and 145.56 is: 217.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    147 : 219.39 = 145.56 : x
  2. Step 2: Convert to fraction form
    147/219.39 = 145.56/x
  3. Step 3: Cross multiply
    147x = 219.39 × 145.56
  4. Step 4: Simplify right side
    147x = 31,934.41
  5. Step 5: Solve for x
    x = 31,934.41/147
  6. Step 6: Final answer
    x = 217.24

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.