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Finding the Fourth Proportional to 261.02, 391.46 and 78.44

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Solution

The fourth proportional to 261.02, 391.46 and 78.44 is: 117.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.02 : 391.46 = 78.44 : x
  2. Step 2: Convert to fraction form
    261.02/391.46 = 78.44/x
  3. Step 3: Cross multiply
    261.02x = 391.46 × 78.44
  4. Step 4: Simplify right side
    261.02x = 30,706.12
  5. Step 5: Solve for x
    x = 30,706.12/261.02
  6. Step 6: Final answer
    x = 117.64

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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.