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Finding the Fourth Proportional to 888.69, 1,332.81 and 426.39

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Solution

The fourth proportional to 888.69, 1,332.81 and 426.39 is: 639.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.69 : 1,332.81 = 426.39 : x
  2. Step 2: Convert to fraction form
    888.69/1,332.81 = 426.39/x
  3. Step 3: Cross multiply
    888.69x = 1,332.81 × 426.39
  4. Step 4: Simplify right side
    888.69x = 568,291.86
  5. Step 5: Solve for x
    x = 568,291.86/888.69
  6. Step 6: Final answer
    x = 639.47

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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.