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Finding the Fourth Proportional to 809.77, 1,213.18 and 646.26

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Solution

The fourth proportional to 809.77, 1,213.18 and 646.26 is: 968.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.77 : 1,213.18 = 646.26 : x
  2. Step 2: Convert to fraction form
    809.77/1,213.18 = 646.26/x
  3. Step 3: Cross multiply
    809.77x = 1,213.18 × 646.26
  4. Step 4: Simplify right side
    809.77x = 784,029.71
  5. Step 5: Solve for x
    x = 784,029.71/809.77
  6. Step 6: Final answer
    x = 968.21

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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.