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Finding the Fourth Proportional to 72.61, 108.61 and 68.35

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Solution

The fourth proportional to 72.61, 108.61 and 68.35 is: 102.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.61 : 108.61 = 68.35 : x
  2. Step 2: Convert to fraction form
    72.61/108.61 = 68.35/x
  3. Step 3: Cross multiply
    72.61x = 108.61 × 68.35
  4. Step 4: Simplify right side
    72.61x = 7,423.49
  5. Step 5: Solve for x
    x = 7,423.49/72.61
  6. Step 6: Final answer
    x = 102.24

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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.