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Finding the Fourth Proportional to 809.76, 1,116.64 and 613.72

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Solution

The fourth proportional to 809.76, 1,116.64 and 613.72 is: 846.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.76 : 1,116.64 = 613.72 : x
  2. Step 2: Convert to fraction form
    809.76/1,116.64 = 613.72/x
  3. Step 3: Cross multiply
    809.76x = 1,116.64 × 613.72
  4. Step 4: Simplify right side
    809.76x = 685,304.30
  5. Step 5: Solve for x
    x = 685,304.30/809.76
  6. Step 6: Final answer
    x = 846.31

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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.