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Finding the Fourth Proportional to 621.64, 859.17 and 551.17

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Solution

The fourth proportional to 621.64, 859.17 and 551.17 is: 761.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.64 : 859.17 = 551.17 : x
  2. Step 2: Convert to fraction form
    621.64/859.17 = 551.17/x
  3. Step 3: Cross multiply
    621.64x = 859.17 × 551.17
  4. Step 4: Simplify right side
    621.64x = 473,548.73
  5. Step 5: Solve for x
    x = 473,548.73/621.64
  6. Step 6: Final answer
    x = 761.77

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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.