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Finding the Fourth Proportional to 806.57, 1,112.56 and 491.61

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Solution

The fourth proportional to 806.57, 1,112.56 and 491.61 is: 678.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.57 : 1,112.56 = 491.61 : x
  2. Step 2: Convert to fraction form
    806.57/1,112.56 = 491.61/x
  3. Step 3: Cross multiply
    806.57x = 1,112.56 × 491.61
  4. Step 4: Simplify right side
    806.57x = 546,945.62
  5. Step 5: Solve for x
    x = 546,945.62/806.57
  6. Step 6: Final answer
    x = 678.11

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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.