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Finding the Fourth Proportional to 784.77, 1,084.31 and 563.28

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Solution

The fourth proportional to 784.77, 1,084.31 and 563.28 is: 778.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.77 : 1,084.31 = 563.28 : x
  2. Step 2: Convert to fraction form
    784.77/1,084.31 = 563.28/x
  3. Step 3: Cross multiply
    784.77x = 1,084.31 × 563.28
  4. Step 4: Simplify right side
    784.77x = 610,770.14
  5. Step 5: Solve for x
    x = 610,770.14/784.77
  6. Step 6: Final answer
    x = 778.28

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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.