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Finding the Fourth Proportional to 143.72, 215.58 and 83.28

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Solution

The fourth proportional to 143.72, 215.58 and 83.28 is: 124.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.72 : 215.58 = 83.28 : x
  2. Step 2: Convert to fraction form
    143.72/215.58 = 83.28/x
  3. Step 3: Cross multiply
    143.72x = 215.58 × 83.28
  4. Step 4: Simplify right side
    143.72x = 17,953.50
  5. Step 5: Solve for x
    x = 17,953.50/143.72
  6. Step 6: Final answer
    x = 124.92

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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.