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Finding the Fourth Proportional to 320.16, 477.92 and 287.68

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Solution

The fourth proportional to 320.16, 477.92 and 287.68 is: 429.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.16 : 477.92 = 287.68 : x
  2. Step 2: Convert to fraction form
    320.16/477.92 = 287.68/x
  3. Step 3: Cross multiply
    320.16x = 477.92 × 287.68
  4. Step 4: Simplify right side
    320.16x = 137,488.03
  5. Step 5: Solve for x
    x = 137,488.03/320.16
  6. Step 6: Final answer
    x = 429.44

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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.