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Finding the Fourth Proportional to 261, 389.88 and 214.83

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Solution

The fourth proportional to 261, 389.88 and 214.83 is: 320.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    261 : 389.88 = 214.83 : x
  2. Step 2: Convert to fraction form
    261/389.88 = 214.83/x
  3. Step 3: Cross multiply
    261x = 389.88 × 214.83
  4. Step 4: Simplify right side
    261x = 83,757.92
  5. Step 5: Solve for x
    x = 83,757.92/261
  6. Step 6: Final answer
    x = 320.91

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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.