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Finding the Fourth Proportional to 389.89, 584.07 and 312.49

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Solution

The fourth proportional to 389.89, 584.07 and 312.49 is: 468.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.89 : 584.07 = 312.49 : x
  2. Step 2: Convert to fraction form
    389.89/584.07 = 312.49/x
  3. Step 3: Cross multiply
    389.89x = 584.07 × 312.49
  4. Step 4: Simplify right side
    389.89x = 182,516.47
  5. Step 5: Solve for x
    x = 182,516.47/389.89
  6. Step 6: Final answer
    x = 468.12

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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.