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Finding the Fourth Proportional to 294.80, 406.62 and 284.78

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Solution

The fourth proportional to 294.80, 406.62 and 284.78 is: 392.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    294.80 : 406.62 = 284.78 : x
  2. Step 2: Convert to fraction form
    294.80/406.62 = 284.78/x
  3. Step 3: Cross multiply
    294.80x = 406.62 × 284.78
  4. Step 4: Simplify right side
    294.80x = 115,795.21
  5. Step 5: Solve for x
    x = 115,795.21/294.80
  6. Step 6: Final answer
    x = 392.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.