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Finding the Fourth Proportional to 315.81, 474.17 and 272.93

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Solution

The fourth proportional to 315.81, 474.17 and 272.93 is: 409.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.81 : 474.17 = 272.93 : x
  2. Step 2: Convert to fraction form
    315.81/474.17 = 272.93/x
  3. Step 3: Cross multiply
    315.81x = 474.17 × 272.93
  4. Step 4: Simplify right side
    315.81x = 129,411.48
  5. Step 5: Solve for x
    x = 129,411.48/315.81
  6. Step 6: Final answer
    x = 409.78

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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.