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Finding the Fourth Proportional to 79.37, 109.49 and 53.15

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Solution

The fourth proportional to 79.37, 109.49 and 53.15 is: 73.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.37 : 109.49 = 53.15 : x
  2. Step 2: Convert to fraction form
    79.37/109.49 = 53.15/x
  3. Step 3: Cross multiply
    79.37x = 109.49 × 53.15
  4. Step 4: Simplify right side
    79.37x = 5,819.39
  5. Step 5: Solve for x
    x = 5,819.39/79.37
  6. Step 6: Final answer
    x = 73.32

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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.