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Finding the Fourth Proportional to 143.38, 215.06 and 47.18

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Solution

The fourth proportional to 143.38, 215.06 and 47.18 is: 70.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.38 : 215.06 = 47.18 : x
  2. Step 2: Convert to fraction form
    143.38/215.06 = 47.18/x
  3. Step 3: Cross multiply
    143.38x = 215.06 × 47.18
  4. Step 4: Simplify right side
    143.38x = 10,146.53
  5. Step 5: Solve for x
    x = 10,146.53/143.38
  6. Step 6: Final answer
    x = 70.77

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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.