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Finding the Fourth Proportional to 315.68, 471.86 and 274.22

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Solution

The fourth proportional to 315.68, 471.86 and 274.22 is: 409.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.68 : 471.86 = 274.22 : x
  2. Step 2: Convert to fraction form
    315.68/471.86 = 274.22/x
  3. Step 3: Cross multiply
    315.68x = 471.86 × 274.22
  4. Step 4: Simplify right side
    315.68x = 129,389.72
  5. Step 5: Solve for x
    x = 129,389.72/315.68
  6. Step 6: Final answer
    x = 409.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.