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Finding the Fourth Proportional to 79.61, 119.82 and 56.94

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Solution

The fourth proportional to 79.61, 119.82 and 56.94 is: 85.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.61 : 119.82 = 56.94 : x
  2. Step 2: Convert to fraction form
    79.61/119.82 = 56.94/x
  3. Step 3: Cross multiply
    79.61x = 119.82 × 56.94
  4. Step 4: Simplify right side
    79.61x = 6,822.31
  5. Step 5: Solve for x
    x = 6,822.31/79.61
  6. Step 6: Final answer
    x = 85.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.