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Finding the Fourth Proportional to 79.24, 109.32 and 51.58

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Solution

The fourth proportional to 79.24, 109.32 and 51.58 is: 71.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.24 : 109.32 = 51.58 : x
  2. Step 2: Convert to fraction form
    79.24/109.32 = 51.58/x
  3. Step 3: Cross multiply
    79.24x = 109.32 × 51.58
  4. Step 4: Simplify right side
    79.24x = 5,638.73
  5. Step 5: Solve for x
    x = 5,638.73/79.24
  6. Step 6: Final answer
    x = 71.16

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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.