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Finding the Fourth Proportional to 809.19, 1,216.22 and 719.28

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Solution

The fourth proportional to 809.19, 1,216.22 and 719.28 is: 1,081.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.19 : 1,216.22 = 719.28 : x
  2. Step 2: Convert to fraction form
    809.19/1,216.22 = 719.28/x
  3. Step 3: Cross multiply
    809.19x = 1,216.22 × 719.28
  4. Step 4: Simplify right side
    809.19x = 874,799.13
  5. Step 5: Solve for x
    x = 874,799.13/809.19
  6. Step 6: Final answer
    x = 1,081.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.