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Finding the Fourth Proportional to 79.16, 109.13 and 63.63

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Solution

The fourth proportional to 79.16, 109.13 and 63.63 is: 87.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.16 : 109.13 = 63.63 : x
  2. Step 2: Convert to fraction form
    79.16/109.13 = 63.63/x
  3. Step 3: Cross multiply
    79.16x = 109.13 × 63.63
  4. Step 4: Simplify right side
    79.16x = 6,943.62
  5. Step 5: Solve for x
    x = 6,943.62/79.16
  6. Step 6: Final answer
    x = 87.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.