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Finding the Fourth Proportional to 861, 1,188.11 and 488.00

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Solution

The fourth proportional to 861, 1,188.11 and 488.00 is: 673.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    861 : 1,188.11 = 488.00 : x
  2. Step 2: Convert to fraction form
    861/1,188.11 = 488.00/x
  3. Step 3: Cross multiply
    861x = 1,188.11 × 488.00
  4. Step 4: Simplify right side
    861x = 579,789.30
  5. Step 5: Solve for x
    x = 579,789.30/861
  6. Step 6: Final answer
    x = 673.39

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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.