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Finding the Fourth Proportional to 79.61, 119.32 and 56.79

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Solution

The fourth proportional to 79.61, 119.32 and 56.79 is: 85.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.61 : 119.32 = 56.79 : x
  2. Step 2: Convert to fraction form
    79.61/119.32 = 56.79/x
  3. Step 3: Cross multiply
    79.61x = 119.32 × 56.79
  4. Step 4: Simplify right side
    79.61x = 6,775.90
  5. Step 5: Solve for x
    x = 6,775.90/79.61
  6. Step 6: Final answer
    x = 85.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.