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Finding the Fourth Proportional to 143.76, 215.62 and 47.56

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Solution

The fourth proportional to 143.76, 215.62 and 47.56 is: 71.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.76 : 215.62 = 47.56 : x
  2. Step 2: Convert to fraction form
    143.76/215.62 = 47.56/x
  3. Step 3: Cross multiply
    143.76x = 215.62 × 47.56
  4. Step 4: Simplify right side
    143.76x = 10,254.89
  5. Step 5: Solve for x
    x = 10,254.89/143.76
  6. Step 6: Final answer
    x = 71.33

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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.