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Finding the Fourth Proportional to 783.32, 1,080.31 and 617.27

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Solution

The fourth proportional to 783.32, 1,080.31 and 617.27 is: 851.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.32 : 1,080.31 = 617.27 : x
  2. Step 2: Convert to fraction form
    783.32/1,080.31 = 617.27/x
  3. Step 3: Cross multiply
    783.32x = 1,080.31 × 617.27
  4. Step 4: Simplify right side
    783.32x = 666,837.55
  5. Step 5: Solve for x
    x = 666,837.55/783.32
  6. Step 6: Final answer
    x = 851.30

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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.