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Finding the Fourth Proportional to 261.46, 390.92 and 223.40

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Solution

The fourth proportional to 261.46, 390.92 and 223.40 is: 334.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.46 : 390.92 = 223.40 : x
  2. Step 2: Convert to fraction form
    261.46/390.92 = 223.40/x
  3. Step 3: Cross multiply
    261.46x = 390.92 × 223.40
  4. Step 4: Simplify right side
    261.46x = 87,331.53
  5. Step 5: Solve for x
    x = 87,331.53/261.46
  6. Step 6: Final answer
    x = 334.01

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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.