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Finding the Fourth Proportional to 809.88, 1,116.36 and 711.47

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Solution

The fourth proportional to 809.88, 1,116.36 and 711.47 is: 980.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.88 : 1,116.36 = 711.47 : x
  2. Step 2: Convert to fraction form
    809.88/1,116.36 = 711.47/x
  3. Step 3: Cross multiply
    809.88x = 1,116.36 × 711.47
  4. Step 4: Simplify right side
    809.88x = 794,251.07
  5. Step 5: Solve for x
    x = 794,251.07/809.88
  6. Step 6: Final answer
    x = 980.70

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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.