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Finding the Fourth Proportional to 621.63, 931.91 and 415.62

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Solution

The fourth proportional to 621.63, 931.91 and 415.62 is: 623.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.63 : 931.91 = 415.62 : x
  2. Step 2: Convert to fraction form
    621.63/931.91 = 415.62/x
  3. Step 3: Cross multiply
    621.63x = 931.91 × 415.62
  4. Step 4: Simplify right side
    621.63x = 387,318.36
  5. Step 5: Solve for x
    x = 387,318.36/621.63
  6. Step 6: Final answer
    x = 623.07

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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.