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Finding the Fourth Proportional to 621.36, 931.20 and 274.64

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Solution

The fourth proportional to 621.36, 931.20 and 274.64 is: 411.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.36 : 931.20 = 274.64 : x
  2. Step 2: Convert to fraction form
    621.36/931.20 = 274.64/x
  3. Step 3: Cross multiply
    621.36x = 931.20 × 274.64
  4. Step 4: Simplify right side
    621.36x = 255,740.11
  5. Step 5: Solve for x
    x = 255,740.11/621.36
  6. Step 6: Final answer
    x = 411.58

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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.