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Finding the Fourth Proportional to 322.16, 479.80 and 305.60

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Solution

The fourth proportional to 322.16, 479.80 and 305.60 is: 455.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.16 : 479.80 = 305.60 : x
  2. Step 2: Convert to fraction form
    322.16/479.80 = 305.60/x
  3. Step 3: Cross multiply
    322.16x = 479.80 × 305.60
  4. Step 4: Simplify right side
    322.16x = 146,626.88
  5. Step 5: Solve for x
    x = 146,626.88/322.16
  6. Step 6: Final answer
    x = 455.14

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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.