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Finding the Fourth Proportional to 261.18, 391.77 and 188.28

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Solution

The fourth proportional to 261.18, 391.77 and 188.28 is: 282.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.18 : 391.77 = 188.28 : x
  2. Step 2: Convert to fraction form
    261.18/391.77 = 188.28/x
  3. Step 3: Cross multiply
    261.18x = 391.77 × 188.28
  4. Step 4: Simplify right side
    261.18x = 73,762.46
  5. Step 5: Solve for x
    x = 73,762.46/261.18
  6. Step 6: Final answer
    x = 282.42

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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.