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Finding the Fourth Proportional to 862.13, 1,189.74 and 512.82

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Solution

The fourth proportional to 862.13, 1,189.74 and 512.82 is: 707.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.13 : 1,189.74 = 512.82 : x
  2. Step 2: Convert to fraction form
    862.13/1,189.74 = 512.82/x
  3. Step 3: Cross multiply
    862.13x = 1,189.74 × 512.82
  4. Step 4: Simplify right side
    862.13x = 610,122.47
  5. Step 5: Solve for x
    x = 610,122.47/862.13
  6. Step 6: Final answer
    x = 707.70

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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.