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Finding the Fourth Proportional to 806.10, 1,112.72 and 511.80

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Solution

The fourth proportional to 806.10, 1,112.72 and 511.80 is: 706.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.10 : 1,112.72 = 511.80 : x
  2. Step 2: Convert to fraction form
    806.10/1,112.72 = 511.80/x
  3. Step 3: Cross multiply
    806.10x = 1,112.72 × 511.80
  4. Step 4: Simplify right side
    806.10x = 569,487.54
  5. Step 5: Solve for x
    x = 569,487.54/806.10
  6. Step 6: Final answer
    x = 706.47

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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.