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Finding the Fourth Proportional to 783.20, 1,080.85 and 451.64

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Solution

The fourth proportional to 783.20, 1,080.85 and 451.64 is: 623.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.20 : 1,080.85 = 451.64 : x
  2. Step 2: Convert to fraction form
    783.20/1,080.85 = 451.64/x
  3. Step 3: Cross multiply
    783.20x = 1,080.85 × 451.64
  4. Step 4: Simplify right side
    783.20x = 488,155.54
  5. Step 5: Solve for x
    x = 488,155.54/783.20
  6. Step 6: Final answer
    x = 623.28

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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.