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Finding the Fourth Proportional to 864.87, 1,297.28 and 215.59

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Solution

The fourth proportional to 864.87, 1,297.28 and 215.59 is: 323.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.87 : 1,297.28 = 215.59 : x
  2. Step 2: Convert to fraction form
    864.87/1,297.28 = 215.59/x
  3. Step 3: Cross multiply
    864.87x = 1,297.28 × 215.59
  4. Step 4: Simplify right side
    864.87x = 279,680.60
  5. Step 5: Solve for x
    x = 279,680.60/864.87
  6. Step 6: Final answer
    x = 323.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.