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Finding the Fourth Proportional to 261.92, 393 and 117.80

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Solution

The fourth proportional to 261.92, 393 and 117.80 is: 176.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.92 : 393 = 117.80 : x
  2. Step 2: Convert to fraction form
    261.92/393 = 117.80/x
  3. Step 3: Cross multiply
    261.92x = 393 × 117.80
  4. Step 4: Simplify right side
    261.92x = 46,295.40
  5. Step 5: Solve for x
    x = 46,295.40/261.92
  6. Step 6: Final answer
    x = 176.75

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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.