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Finding the Fourth Proportional to 888.64, 1,226.28 and 515.80

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Solution

The fourth proportional to 888.64, 1,226.28 and 515.80 is: 711.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.64 : 1,226.28 = 515.80 : x
  2. Step 2: Convert to fraction form
    888.64/1,226.28 = 515.80/x
  3. Step 3: Cross multiply
    888.64x = 1,226.28 × 515.80
  4. Step 4: Simplify right side
    888.64x = 632,515.22
  5. Step 5: Solve for x
    x = 632,515.22/888.64
  6. Step 6: Final answer
    x = 711.78

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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.