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Finding the Fourth Proportional to 621.38, 926.65 and 551.45

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Solution

The fourth proportional to 621.38, 926.65 and 551.45 is: 822.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.38 : 926.65 = 551.45 : x
  2. Step 2: Convert to fraction form
    621.38/926.65 = 551.45/x
  3. Step 3: Cross multiply
    621.38x = 926.65 × 551.45
  4. Step 4: Simplify right side
    621.38x = 511,001.14
  5. Step 5: Solve for x
    x = 511,001.14/621.38
  6. Step 6: Final answer
    x = 822.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.