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Finding the Fourth Proportional to 782.86, 1,080.34 and 451.28

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Solution

The fourth proportional to 782.86, 1,080.34 and 451.28 is: 622.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.86 : 1,080.34 = 451.28 : x
  2. Step 2: Convert to fraction form
    782.86/1,080.34 = 451.28/x
  3. Step 3: Cross multiply
    782.86x = 1,080.34 × 451.28
  4. Step 4: Simplify right side
    782.86x = 487,533.13
  5. Step 5: Solve for x
    x = 487,533.13/782.86
  6. Step 6: Final answer
    x = 622.76

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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.