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Finding the Fourth Proportional to 861.37, 1,188.69 and 468.39

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Solution

The fourth proportional to 861.37, 1,188.69 and 468.39 is: 646.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.37 : 1,188.69 = 468.39 : x
  2. Step 2: Convert to fraction form
    861.37/1,188.69 = 468.39/x
  3. Step 3: Cross multiply
    861.37x = 1,188.69 × 468.39
  4. Step 4: Simplify right side
    861.37x = 556,770.51
  5. Step 5: Solve for x
    x = 556,770.51/861.37
  6. Step 6: Final answer
    x = 646.38

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1.5x scale

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.