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Finding the Fourth Proportional to 621.27, 931.27 and 390.32

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Solution

The fourth proportional to 621.27, 931.27 and 390.32 is: 585.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.27 : 931.27 = 390.32 : x
  2. Step 2: Convert to fraction form
    621.27/931.27 = 390.32/x
  3. Step 3: Cross multiply
    621.27x = 931.27 × 390.32
  4. Step 4: Simplify right side
    621.27x = 363,493.31
  5. Step 5: Solve for x
    x = 363,493.31/621.27
  6. Step 6: Final answer
    x = 585.08

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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.