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Finding the Fourth Proportional to 703.78, 971.18 and 409.00

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Solution

The fourth proportional to 703.78, 971.18 and 409.00 is: 564.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.78 : 971.18 = 409.00 : x
  2. Step 2: Convert to fraction form
    703.78/971.18 = 409.00/x
  3. Step 3: Cross multiply
    703.78x = 971.18 × 409.00
  4. Step 4: Simplify right side
    703.78x = 397,205.72
  5. Step 5: Solve for x
    x = 397,205.72/703.78
  6. Step 6: Final answer
    x = 564.39

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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.