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Finding the Fourth Proportional to 143.72, 215.21 and 98.16

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Solution

The fourth proportional to 143.72, 215.21 and 98.16 is: 146.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.72 : 215.21 = 98.16 : x
  2. Step 2: Convert to fraction form
    143.72/215.21 = 98.16/x
  3. Step 3: Cross multiply
    143.72x = 215.21 × 98.16
  4. Step 4: Simplify right side
    143.72x = 21,125.01
  5. Step 5: Solve for x
    x = 21,125.01/143.72
  6. Step 6: Final answer
    x = 146.99

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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.