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Finding the Fourth Proportional to 261.38, 389.94 and 253.94

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Solution

The fourth proportional to 261.38, 389.94 and 253.94 is: 378.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.38 : 389.94 = 253.94 : x
  2. Step 2: Convert to fraction form
    261.38/389.94 = 253.94/x
  3. Step 3: Cross multiply
    261.38x = 389.94 × 253.94
  4. Step 4: Simplify right side
    261.38x = 99,019.18
  5. Step 5: Solve for x
    x = 99,019.18/261.38
  6. Step 6: Final answer
    x = 378.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.