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Finding the Fourth Proportional to 261.71, 361.09 and 155.33

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Solution

The fourth proportional to 261.71, 361.09 and 155.33 is: 214.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.71 : 361.09 = 155.33 : x
  2. Step 2: Convert to fraction form
    261.71/361.09 = 155.33/x
  3. Step 3: Cross multiply
    261.71x = 361.09 × 155.33
  4. Step 4: Simplify right side
    261.71x = 56,088.11
  5. Step 5: Solve for x
    x = 56,088.11/261.71
  6. Step 6: Final answer
    x = 214.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.