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Finding the Fourth Proportional to 859.54, 1,186.28 and 639.13

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Solution

The fourth proportional to 859.54, 1,186.28 and 639.13 is: 882.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.54 : 1,186.28 = 639.13 : x
  2. Step 2: Convert to fraction form
    859.54/1,186.28 = 639.13/x
  3. Step 3: Cross multiply
    859.54x = 1,186.28 × 639.13
  4. Step 4: Simplify right side
    859.54x = 758,187.14
  5. Step 5: Solve for x
    x = 758,187.14/859.54
  6. Step 6: Final answer
    x = 882.08

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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.