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Finding the Fourth Proportional to 862.40, 1,188.69 and 610.00

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Solution

The fourth proportional to 862.40, 1,188.69 and 610.00 is: 840.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.40 : 1,188.69 = 610.00 : x
  2. Step 2: Convert to fraction form
    862.40/1,188.69 = 610.00/x
  3. Step 3: Cross multiply
    862.40x = 1,188.69 × 610.00
  4. Step 4: Simplify right side
    862.40x = 725,098.25
  5. Step 5: Solve for x
    x = 725,098.25/862.40
  6. Step 6: Final answer
    x = 840.79

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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.