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Finding the Fourth Proportional to 313.18, 469.78 and 82.06

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Solution

The fourth proportional to 313.18, 469.78 and 82.06 is: 123.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.18 : 469.78 = 82.06 : x
  2. Step 2: Convert to fraction form
    313.18/469.78 = 82.06/x
  3. Step 3: Cross multiply
    313.18x = 469.78 × 82.06
  4. Step 4: Simplify right side
    313.18x = 38,550.15
  5. Step 5: Solve for x
    x = 38,550.15/313.18
  6. Step 6: Final answer
    x = 123.09

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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.