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Finding the Fourth Proportional to 96.98, 145.26 and 72.86

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Solution

The fourth proportional to 96.98, 145.26 and 72.86 is: 109.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.98 : 145.26 = 72.86 : x
  2. Step 2: Convert to fraction form
    96.98/145.26 = 72.86/x
  3. Step 3: Cross multiply
    96.98x = 145.26 × 72.86
  4. Step 4: Simplify right side
    96.98x = 10,583.64
  5. Step 5: Solve for x
    x = 10,583.64/96.98
  6. Step 6: Final answer
    x = 109.13

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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.