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Finding the Fourth Proportional to 612.11, 916.16 and 381.21

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Solution

The fourth proportional to 612.11, 916.16 and 381.21 is: 570.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.11 : 916.16 = 381.21 : x
  2. Step 2: Convert to fraction form
    612.11/916.16 = 381.21/x
  3. Step 3: Cross multiply
    612.11x = 916.16 × 381.21
  4. Step 4: Simplify right side
    612.11x = 349,246.16
  5. Step 5: Solve for x
    x = 349,246.16/612.11
  6. Step 6: Final answer
    x = 570.56

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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.