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Finding the Fourth Proportional to 639.04, 955.77 and 551.56

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Solution

The fourth proportional to 639.04, 955.77 and 551.56 is: 824.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.04 : 955.77 = 551.56 : x
  2. Step 2: Convert to fraction form
    639.04/955.77 = 551.56/x
  3. Step 3: Cross multiply
    639.04x = 955.77 × 551.56
  4. Step 4: Simplify right side
    639.04x = 527,164.50
  5. Step 5: Solve for x
    x = 527,164.50/639.04
  6. Step 6: Final answer
    x = 824.93

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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.