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Finding the Fourth Proportional to 404.84, 554.17 and 391.72

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Solution

The fourth proportional to 404.84, 554.17 and 391.72 is: 536.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.84 : 554.17 = 391.72 : x
  2. Step 2: Convert to fraction form
    404.84/554.17 = 391.72/x
  3. Step 3: Cross multiply
    404.84x = 554.17 × 391.72
  4. Step 4: Simplify right side
    404.84x = 217,079.47
  5. Step 5: Solve for x
    x = 217,079.47/404.84
  6. Step 6: Final answer
    x = 536.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.