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Finding the Fourth Proportional to 806.76, 1,112.94 and 783

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Solution

The fourth proportional to 806.76, 1,112.94 and 783 is: 1,080.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.76 : 1,112.94 = 783 : x
  2. Step 2: Convert to fraction form
    806.76/1,112.94 = 783/x
  3. Step 3: Cross multiply
    806.76x = 1,112.94 × 783
  4. Step 4: Simplify right side
    806.76x = 871,432.02
  5. Step 5: Solve for x
    x = 871,432.02/806.76
  6. Step 6: Final answer
    x = 1,080.16

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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.