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Finding the Fourth Proportional to 806.26, 1,112.73 and 491.70

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Solution

The fourth proportional to 806.26, 1,112.73 and 491.70 is: 678.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.26 : 1,112.73 = 491.70 : x
  2. Step 2: Convert to fraction form
    806.26/1,112.73 = 491.70/x
  3. Step 3: Cross multiply
    806.26x = 1,112.73 × 491.70
  4. Step 4: Simplify right side
    806.26x = 547,129.34
  5. Step 5: Solve for x
    x = 547,129.34/806.26
  6. Step 6: Final answer
    x = 678.60

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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.