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Finding the Fourth Proportional to 621.15, 931.38 and 274.29

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Solution

The fourth proportional to 621.15, 931.38 and 274.29 is: 411.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.15 : 931.38 = 274.29 : x
  2. Step 2: Convert to fraction form
    621.15/931.38 = 274.29/x
  3. Step 3: Cross multiply
    621.15x = 931.38 × 274.29
  4. Step 4: Simplify right side
    621.15x = 255,468.22
  5. Step 5: Solve for x
    x = 255,468.22/621.15
  6. Step 6: Final answer
    x = 411.28

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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.