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Finding the Fourth Proportional to 714.78, 986.44 and 400.06

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Solution

The fourth proportional to 714.78, 986.44 and 400.06 is: 552.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.78 : 986.44 = 400.06 : x
  2. Step 2: Convert to fraction form
    714.78/986.44 = 400.06/x
  3. Step 3: Cross multiply
    714.78x = 986.44 × 400.06
  4. Step 4: Simplify right side
    714.78x = 394,635.19
  5. Step 5: Solve for x
    x = 394,635.19/714.78
  6. Step 6: Final answer
    x = 552.11

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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.