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Finding the Fourth Proportional to 806.64, 1,113.78 and 648.76

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Solution

The fourth proportional to 806.64, 1,113.78 and 648.76 is: 895.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.64 : 1,113.78 = 648.76 : x
  2. Step 2: Convert to fraction form
    806.64/1,113.78 = 648.76/x
  3. Step 3: Cross multiply
    806.64x = 1,113.78 × 648.76
  4. Step 4: Simplify right side
    806.64x = 722,577.65
  5. Step 5: Solve for x
    x = 722,577.65/806.64
  6. Step 6: Final answer
    x = 895.78

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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.