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Finding the Fourth Proportional to 313.32, 469.47 and 221.57

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Solution

The fourth proportional to 313.32, 469.47 and 221.57 is: 331.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.32 : 469.47 = 221.57 : x
  2. Step 2: Convert to fraction form
    313.32/469.47 = 221.57/x
  3. Step 3: Cross multiply
    313.32x = 469.47 × 221.57
  4. Step 4: Simplify right side
    313.32x = 104,019.36
  5. Step 5: Solve for x
    x = 104,019.36/313.32
  6. Step 6: Final answer
    x = 331.99

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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.