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Finding the Fourth Proportional to 79.45, 118.95 and 61.45

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Solution

The fourth proportional to 79.45, 118.95 and 61.45 is: 92.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.45 : 118.95 = 61.45 : x
  2. Step 2: Convert to fraction form
    79.45/118.95 = 61.45/x
  3. Step 3: Cross multiply
    79.45x = 118.95 × 61.45
  4. Step 4: Simplify right side
    79.45x = 7,309.48
  5. Step 5: Solve for x
    x = 7,309.48/79.45
  6. Step 6: Final answer
    x = 92.00

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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.