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Finding the Fourth Proportional to 809.36, 1,116.80 and 548.16

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Solution

The fourth proportional to 809.36, 1,116.80 and 548.16 is: 756.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.36 : 1,116.80 = 548.16 : x
  2. Step 2: Convert to fraction form
    809.36/1,116.80 = 548.16/x
  3. Step 3: Cross multiply
    809.36x = 1,116.80 × 548.16
  4. Step 4: Simplify right side
    809.36x = 612,185.09
  5. Step 5: Solve for x
    x = 612,185.09/809.36
  6. Step 6: Final answer
    x = 756.38

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Double scale
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1.5x scale

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.