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Finding the Fourth Proportional to 313.98, 471.16 and 140.76

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Solution

The fourth proportional to 313.98, 471.16 and 140.76 is: 211.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.98 : 471.16 = 140.76 : x
  2. Step 2: Convert to fraction form
    313.98/471.16 = 140.76/x
  3. Step 3: Cross multiply
    313.98x = 471.16 × 140.76
  4. Step 4: Simplify right side
    313.98x = 66,317.77
  5. Step 5: Solve for x
    x = 66,317.77/313.98
  6. Step 6: Final answer
    x = 211.22

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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.