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Finding the Fourth Proportional to 322.56, 480 and 315.84

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Solution

The fourth proportional to 322.56, 480 and 315.84 is: 470.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.56 : 480 = 315.84 : x
  2. Step 2: Convert to fraction form
    322.56/480 = 315.84/x
  3. Step 3: Cross multiply
    322.56x = 480 × 315.84
  4. Step 4: Simplify right side
    322.56x = 151,603.20
  5. Step 5: Solve for x
    x = 151,603.20/322.56
  6. Step 6: Final answer
    x = 470.00

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.