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Finding the Fourth Proportional to 862.22, 1,189.27 and 578.51

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Solution

The fourth proportional to 862.22, 1,189.27 and 578.51 is: 797.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.22 : 1,189.27 = 578.51 : x
  2. Step 2: Convert to fraction form
    862.22/1,189.27 = 578.51/x
  3. Step 3: Cross multiply
    862.22x = 1,189.27 × 578.51
  4. Step 4: Simplify right side
    862.22x = 688,000.87
  5. Step 5: Solve for x
    x = 688,000.87/862.22
  6. Step 6: Final answer
    x = 797.94

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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.