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Finding the Fourth Proportional to 888.50, 1,226.31 and 515.56

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Solution

The fourth proportional to 888.50, 1,226.31 and 515.56 is: 711.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.50 : 1,226.31 = 515.56 : x
  2. Step 2: Convert to fraction form
    888.50/1,226.31 = 515.56/x
  3. Step 3: Cross multiply
    888.50x = 1,226.31 × 515.56
  4. Step 4: Simplify right side
    888.50x = 632,233.81
  5. Step 5: Solve for x
    x = 632,233.81/888.50
  6. Step 6: Final answer
    x = 711.57

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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.