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Finding the Fourth Proportional to 621.10, 931.07 and 274.21

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Solution

The fourth proportional to 621.10, 931.07 and 274.21 is: 411.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.10 : 931.07 = 274.21 : x
  2. Step 2: Convert to fraction form
    621.10/931.07 = 274.21/x
  3. Step 3: Cross multiply
    621.10x = 931.07 × 274.21
  4. Step 4: Simplify right side
    621.10x = 255,307.33
  5. Step 5: Solve for x
    x = 255,307.33/621.10
  6. Step 6: Final answer
    x = 411.06

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1.5x scale

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.