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Finding the Fourth Proportional to 261.78, 392.54 and 117.38

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Solution

The fourth proportional to 261.78, 392.54 and 117.38 is: 176.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.78 : 392.54 = 117.38 : x
  2. Step 2: Convert to fraction form
    261.78/392.54 = 117.38/x
  3. Step 3: Cross multiply
    261.78x = 392.54 × 117.38
  4. Step 4: Simplify right side
    261.78x = 46,073.80
  5. Step 5: Solve for x
    x = 46,073.80/261.78
  6. Step 6: Final answer
    x = 176.00

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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.