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Finding the Fourth Proportional to 887.20, 1,223.64 and 572.51

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Solution

The fourth proportional to 887.20, 1,223.64 and 572.51 is: 789.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.20 : 1,223.64 = 572.51 : x
  2. Step 2: Convert to fraction form
    887.20/1,223.64 = 572.51/x
  3. Step 3: Cross multiply
    887.20x = 1,223.64 × 572.51
  4. Step 4: Simplify right side
    887.20x = 700,546.14
  5. Step 5: Solve for x
    x = 700,546.14/887.20
  6. Step 6: Final answer
    x = 789.61

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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.