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Finding the Fourth Proportional to 342.21, 471.71 and 313.96

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Solution

The fourth proportional to 342.21, 471.71 and 313.96 is: 432.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.21 : 471.71 = 313.96 : x
  2. Step 2: Convert to fraction form
    342.21/471.71 = 313.96/x
  3. Step 3: Cross multiply
    342.21x = 471.71 × 313.96
  4. Step 4: Simplify right side
    342.21x = 148,098.07
  5. Step 5: Solve for x
    x = 148,098.07/342.21
  6. Step 6: Final answer
    x = 432.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.