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Finding the Third Proportional to 562.78 and 891.21

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Solution

The third proportional to 562.78 and 891.21 is: 1,411.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    562.78 : 891.21 = 891.21 : x
  2. Step 2: Convert to fraction form
    562.78/891.21 = 891.21/x
  3. Step 3: Cross multiply
    562.78x = 891.21 × 891.21
  4. Step 4: Simplify right side
    562.78x = 794,256.94
  5. Step 5: Solve for x
    x = 794,256.94/562.78
  6. Step 6: Final answer
    x = 1,411.31

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.