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Finding the Fourth Proportional to 861.25, 1,188.53 and 468.27

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Solution

The fourth proportional to 861.25, 1,188.53 and 468.27 is: 646.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.25 : 1,188.53 = 468.27 : x
  2. Step 2: Convert to fraction form
    861.25/1,188.53 = 468.27/x
  3. Step 3: Cross multiply
    861.25x = 1,188.53 × 468.27
  4. Step 4: Simplify right side
    861.25x = 556,550.60
  5. Step 5: Solve for x
    x = 556,550.60/861.25
  6. Step 6: Final answer
    x = 646.21

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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.