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Finding the Fourth Proportional to 79.04, 117.94 and 71.30

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Solution

The fourth proportional to 79.04, 117.94 and 71.30 is: 106.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.04 : 117.94 = 71.30 : x
  2. Step 2: Convert to fraction form
    79.04/117.94 = 71.30/x
  3. Step 3: Cross multiply
    79.04x = 117.94 × 71.30
  4. Step 4: Simplify right side
    79.04x = 8,409.12
  5. Step 5: Solve for x
    x = 8,409.12/79.04
  6. Step 6: Final answer
    x = 106.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.