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Finding the Fourth Proportional to 261.55, 392.21 and 117.17

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Solution

The fourth proportional to 261.55, 392.21 and 117.17 is: 175.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.55 : 392.21 = 117.17 : x
  2. Step 2: Convert to fraction form
    261.55/392.21 = 117.17/x
  3. Step 3: Cross multiply
    261.55x = 392.21 × 117.17
  4. Step 4: Simplify right side
    261.55x = 45,955.25
  5. Step 5: Solve for x
    x = 45,955.25/261.55
  6. Step 6: Final answer
    x = 175.70

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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.