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Finding the Fourth Proportional to 261.95, 393.04 and 185.40

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Solution

The fourth proportional to 261.95, 393.04 and 185.40 is: 278.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.95 : 393.04 = 185.40 : x
  2. Step 2: Convert to fraction form
    261.95/393.04 = 185.40/x
  3. Step 3: Cross multiply
    261.95x = 393.04 × 185.40
  4. Step 4: Simplify right side
    261.95x = 72,869.62
  5. Step 5: Solve for x
    x = 72,869.62/261.95
  6. Step 6: Final answer
    x = 278.19

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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.