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Finding the Fourth Proportional to 143.32, 215.30 and 79.16

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Solution

The fourth proportional to 143.32, 215.30 and 79.16 is: 118.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.32 : 215.30 = 79.16 : x
  2. Step 2: Convert to fraction form
    143.32/215.30 = 79.16/x
  3. Step 3: Cross multiply
    143.32x = 215.30 × 79.16
  4. Step 4: Simplify right side
    143.32x = 17,043.15
  5. Step 5: Solve for x
    x = 17,043.15/143.32
  6. Step 6: Final answer
    x = 118.92

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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.