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Finding the Fourth Proportional to 880.28, 1,213.26 and 647

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Solution

The fourth proportional to 880.28, 1,213.26 and 647 is: 891.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.28 : 1,213.26 = 647 : x
  2. Step 2: Convert to fraction form
    880.28/1,213.26 = 647/x
  3. Step 3: Cross multiply
    880.28x = 1,213.26 × 647
  4. Step 4: Simplify right side
    880.28x = 784,979.22
  5. Step 5: Solve for x
    x = 784,979.22/880.28
  6. Step 6: Final answer
    x = 891.74

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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.