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Finding the Fourth Proportional to 79.53, 109.76 and 61.08

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Solution

The fourth proportional to 79.53, 109.76 and 61.08 is: 84.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.53 : 109.76 = 61.08 : x
  2. Step 2: Convert to fraction form
    79.53/109.76 = 61.08/x
  3. Step 3: Cross multiply
    79.53x = 109.76 × 61.08
  4. Step 4: Simplify right side
    79.53x = 6,703.84
  5. Step 5: Solve for x
    x = 6,703.84/79.53
  6. Step 6: Final answer
    x = 84.29

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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.