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Finding the Fourth Proportional to 812.10, 1,217.55 and 551.45

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Solution

The fourth proportional to 812.10, 1,217.55 and 551.45 is: 826.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.10 : 1,217.55 = 551.45 : x
  2. Step 2: Convert to fraction form
    812.10/1,217.55 = 551.45/x
  3. Step 3: Cross multiply
    812.10x = 1,217.55 × 551.45
  4. Step 4: Simplify right side
    812.10x = 671,417.95
  5. Step 5: Solve for x
    x = 671,417.95/812.10
  6. Step 6: Final answer
    x = 826.77

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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.