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Finding the Fourth Proportional to 783.10, 1,080.57 and 451.27

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Solution

The fourth proportional to 783.10, 1,080.57 and 451.27 is: 622.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.10 : 1,080.57 = 451.27 : x
  2. Step 2: Convert to fraction form
    783.10/1,080.57 = 451.27/x
  3. Step 3: Cross multiply
    783.10x = 1,080.57 × 451.27
  4. Step 4: Simplify right side
    783.10x = 487,628.82
  5. Step 5: Solve for x
    x = 487,628.82/783.10
  6. Step 6: Final answer
    x = 622.69

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1.5x scale

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.