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Finding the Fourth Proportional to 289.08, 398.97 and 215.28

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Solution

The fourth proportional to 289.08, 398.97 and 215.28 is: 297.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.08 : 398.97 = 215.28 : x
  2. Step 2: Convert to fraction form
    289.08/398.97 = 215.28/x
  3. Step 3: Cross multiply
    289.08x = 398.97 × 215.28
  4. Step 4: Simplify right side
    289.08x = 85,890.26
  5. Step 5: Solve for x
    x = 85,890.26/289.08
  6. Step 6: Final answer
    x = 297.12

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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.