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Finding the Fourth Proportional to 261.43, 392.31 and 170.00

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Solution

The fourth proportional to 261.43, 392.31 and 170.00 is: 255.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.43 : 392.31 = 170.00 : x
  2. Step 2: Convert to fraction form
    261.43/392.31 = 170.00/x
  3. Step 3: Cross multiply
    261.43x = 392.31 × 170.00
  4. Step 4: Simplify right side
    261.43x = 66,692.21
  5. Step 5: Solve for x
    x = 66,692.21/261.43
  6. Step 6: Final answer
    x = 255.11

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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.