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Finding the Fourth Proportional to 381.35, 569.42 and 312.99

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Solution

The fourth proportional to 381.35, 569.42 and 312.99 is: 467.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.35 : 569.42 = 312.99 : x
  2. Step 2: Convert to fraction form
    381.35/569.42 = 312.99/x
  3. Step 3: Cross multiply
    381.35x = 569.42 × 312.99
  4. Step 4: Simplify right side
    381.35x = 178,221.20
  5. Step 5: Solve for x
    x = 178,221.20/381.35
  6. Step 6: Final answer
    x = 467.35

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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.