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Finding the Fourth Proportional to 315.68, 474.21 and 274.68

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Solution

The fourth proportional to 315.68, 474.21 and 274.68 is: 412.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.68 : 474.21 = 274.68 : x
  2. Step 2: Convert to fraction form
    315.68/474.21 = 274.68/x
  3. Step 3: Cross multiply
    315.68x = 474.21 × 274.68
  4. Step 4: Simplify right side
    315.68x = 130,256.00
  5. Step 5: Solve for x
    x = 130,256.00/315.68
  6. Step 6: Final answer
    x = 412.62

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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.