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Finding the Fourth Proportional to 143.28, 214.80 and 74.82

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Solution

The fourth proportional to 143.28, 214.80 and 74.82 is: 112.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.28 : 214.80 = 74.82 : x
  2. Step 2: Convert to fraction form
    143.28/214.80 = 74.82/x
  3. Step 3: Cross multiply
    143.28x = 214.80 × 74.82
  4. Step 4: Simplify right side
    143.28x = 16,071.34
  5. Step 5: Solve for x
    x = 16,071.34/143.28
  6. Step 6: Final answer
    x = 112.17

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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.