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Finding the Fourth Proportional to 621.88, 931.26 and 415.87

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Solution

The fourth proportional to 621.88, 931.26 and 415.87 is: 622.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.88 : 931.26 = 415.87 : x
  2. Step 2: Convert to fraction form
    621.88/931.26 = 415.87/x
  3. Step 3: Cross multiply
    621.88x = 931.26 × 415.87
  4. Step 4: Simplify right side
    621.88x = 387,283.10
  5. Step 5: Solve for x
    x = 387,283.10/621.88
  6. Step 6: Final answer
    x = 622.76

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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.