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Finding the Fourth Proportional to 647.82, 894.30 and 399.35

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Solution

The fourth proportional to 647.82, 894.30 and 399.35 is: 551.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.82 : 894.30 = 399.35 : x
  2. Step 2: Convert to fraction form
    647.82/894.30 = 399.35/x
  3. Step 3: Cross multiply
    647.82x = 894.30 × 399.35
  4. Step 4: Simplify right side
    647.82x = 357,134.23
  5. Step 5: Solve for x
    x = 357,134.23/647.82
  6. Step 6: Final answer
    x = 551.29

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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.