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Finding the Fourth Proportional to 261.32, 390.80 and 195.48

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Solution

The fourth proportional to 261.32, 390.80 and 195.48 is: 292.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.32 : 390.80 = 195.48 : x
  2. Step 2: Convert to fraction form
    261.32/390.80 = 195.48/x
  3. Step 3: Cross multiply
    261.32x = 390.80 × 195.48
  4. Step 4: Simplify right side
    261.32x = 76,393.58
  5. Step 5: Solve for x
    x = 76,393.58/261.32
  6. Step 6: Final answer
    x = 292.34

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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.