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Finding the Fourth Proportional to 809.54, 1,116.86 and 561.07

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Solution

The fourth proportional to 809.54, 1,116.86 and 561.07 is: 774.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.54 : 1,116.86 = 561.07 : x
  2. Step 2: Convert to fraction form
    809.54/1,116.86 = 561.07/x
  3. Step 3: Cross multiply
    809.54x = 1,116.86 × 561.07
  4. Step 4: Simplify right side
    809.54x = 626,635.25
  5. Step 5: Solve for x
    x = 626,635.25/809.54
  6. Step 6: Final answer
    x = 774.06

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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.