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Finding the Fourth Proportional to 390.34, 584.59 and 308.94

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Solution

The fourth proportional to 390.34, 584.59 and 308.94 is: 462.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.34 : 584.59 = 308.94 : x
  2. Step 2: Convert to fraction form
    390.34/584.59 = 308.94/x
  3. Step 3: Cross multiply
    390.34x = 584.59 × 308.94
  4. Step 4: Simplify right side
    390.34x = 180,603.23
  5. Step 5: Solve for x
    x = 180,603.23/390.34
  6. Step 6: Final answer
    x = 462.68

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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.