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Finding the Fourth Proportional to 931.50, 1,286.01 and 621.54

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Solution

The fourth proportional to 931.50, 1,286.01 and 621.54 is: 858.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.50 : 1,286.01 = 621.54 : x
  2. Step 2: Convert to fraction form
    931.50/1,286.01 = 621.54/x
  3. Step 3: Cross multiply
    931.50x = 1,286.01 × 621.54
  4. Step 4: Simplify right side
    931.50x = 799,306.66
  5. Step 5: Solve for x
    x = 799,306.66/931.50
  6. Step 6: Final answer
    x = 858.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.