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Finding the Fourth Proportional to 143.76, 215.34 and 79.50

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Solution

The fourth proportional to 143.76, 215.34 and 79.50 is: 119.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.76 : 215.34 = 79.50 : x
  2. Step 2: Convert to fraction form
    143.76/215.34 = 79.50/x
  3. Step 3: Cross multiply
    143.76x = 215.34 × 79.50
  4. Step 4: Simplify right side
    143.76x = 17,119.53
  5. Step 5: Solve for x
    x = 17,119.53/143.76
  6. Step 6: Final answer
    x = 119.08

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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.