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Finding the Fourth Proportional to 79.30, 109.40 and 59.66

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Solution

The fourth proportional to 79.30, 109.40 and 59.66 is: 82.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.30 : 109.40 = 59.66 : x
  2. Step 2: Convert to fraction form
    79.30/109.40 = 59.66/x
  3. Step 3: Cross multiply
    79.30x = 109.40 × 59.66
  4. Step 4: Simplify right side
    79.30x = 6,526.80
  5. Step 5: Solve for x
    x = 6,526.80/79.30
  6. Step 6: Final answer
    x = 82.31

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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.