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Finding the Fourth Proportional to 390.10, 584.94 and 268.48

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Solution

The fourth proportional to 390.10, 584.94 and 268.48 is: 402.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.10 : 584.94 = 268.48 : x
  2. Step 2: Convert to fraction form
    390.10/584.94 = 268.48/x
  3. Step 3: Cross multiply
    390.10x = 584.94 × 268.48
  4. Step 4: Simplify right side
    390.10x = 157,044.69
  5. Step 5: Solve for x
    x = 157,044.69/390.10
  6. Step 6: Final answer
    x = 402.58

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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.