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Finding the Fourth Proportional to 865.58, 1,194.50 and 511.50

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Solution

The fourth proportional to 865.58, 1,194.50 and 511.50 is: 705.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.58 : 1,194.50 = 511.50 : x
  2. Step 2: Convert to fraction form
    865.58/1,194.50 = 511.50/x
  3. Step 3: Cross multiply
    865.58x = 1,194.50 × 511.50
  4. Step 4: Simplify right side
    865.58x = 610,986.75
  5. Step 5: Solve for x
    x = 610,986.75/865.58
  6. Step 6: Final answer
    x = 705.87

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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.