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Finding the Fourth Proportional to 859.92, 1,186.86 and 561.90

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Solution

The fourth proportional to 859.92, 1,186.86 and 561.90 is: 775.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.92 : 1,186.86 = 561.90 : x
  2. Step 2: Convert to fraction form
    859.92/1,186.86 = 561.90/x
  3. Step 3: Cross multiply
    859.92x = 1,186.86 × 561.90
  4. Step 4: Simplify right side
    859.92x = 666,896.63
  5. Step 5: Solve for x
    x = 666,896.63/859.92
  6. Step 6: Final answer
    x = 775.53

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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.