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Finding the Fourth Proportional to 480.65, 662.85 and 314.78

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Solution

The fourth proportional to 480.65, 662.85 and 314.78 is: 434.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.65 : 662.85 = 314.78 : x
  2. Step 2: Convert to fraction form
    480.65/662.85 = 314.78/x
  3. Step 3: Cross multiply
    480.65x = 662.85 × 314.78
  4. Step 4: Simplify right side
    480.65x = 208,648.61
  5. Step 5: Solve for x
    x = 208,648.61/480.65
  6. Step 6: Final answer
    x = 434.10

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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.