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Finding the Fourth Proportional to 313.39, 469.10 and 215.31

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Solution

The fourth proportional to 313.39, 469.10 and 215.31 is: 322.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.39 : 469.10 = 215.31 : x
  2. Step 2: Convert to fraction form
    313.39/469.10 = 215.31/x
  3. Step 3: Cross multiply
    313.39x = 469.10 × 215.31
  4. Step 4: Simplify right side
    313.39x = 101,002.02
  5. Step 5: Solve for x
    x = 101,002.02/313.39
  6. Step 6: Final answer
    x = 322.29

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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.