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Finding the Fourth Proportional to 78.70, 118.02 and 48.22

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Solution

The fourth proportional to 78.70, 118.02 and 48.22 is: 72.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.70 : 118.02 = 48.22 : x
  2. Step 2: Convert to fraction form
    78.70/118.02 = 48.22/x
  3. Step 3: Cross multiply
    78.70x = 118.02 × 48.22
  4. Step 4: Simplify right side
    78.70x = 5,690.92
  5. Step 5: Solve for x
    x = 5,690.92/78.70
  6. Step 6: Final answer
    x = 72.31

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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.