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Finding the Fourth Proportional to 312.71, 469.26 and 215.30

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Solution

The fourth proportional to 312.71, 469.26 and 215.30 is: 323.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.71 : 469.26 = 215.30 : x
  2. Step 2: Convert to fraction form
    312.71/469.26 = 215.30/x
  3. Step 3: Cross multiply
    312.71x = 469.26 × 215.30
  4. Step 4: Simplify right side
    312.71x = 101,029.33
  5. Step 5: Solve for x
    x = 101,029.33/312.71
  6. Step 6: Final answer
    x = 323.08

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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.