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Finding the Fourth Proportional to 476.67, 656.78 and 321.15

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Solution

The fourth proportional to 476.67, 656.78 and 321.15 is: 442.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.67 : 656.78 = 321.15 : x
  2. Step 2: Convert to fraction form
    476.67/656.78 = 321.15/x
  3. Step 3: Cross multiply
    476.67x = 656.78 × 321.15
  4. Step 4: Simplify right side
    476.67x = 210,924.90
  5. Step 5: Solve for x
    x = 210,924.90/476.67
  6. Step 6: Final answer
    x = 442.50

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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.