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Finding the Fourth Proportional to 79.31, 109.40 and 46.54

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Solution

The fourth proportional to 79.31, 109.40 and 46.54 is: 64.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.31 : 109.40 = 46.54 : x
  2. Step 2: Convert to fraction form
    79.31/109.40 = 46.54/x
  3. Step 3: Cross multiply
    79.31x = 109.40 × 46.54
  4. Step 4: Simplify right side
    79.31x = 5,091.48
  5. Step 5: Solve for x
    x = 5,091.48/79.31
  6. Step 6: Final answer
    x = 64.20

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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.