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Finding the Fourth Proportional to 783.29, 1,080.87 and 451.69

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Solution

The fourth proportional to 783.29, 1,080.87 and 451.69 is: 623.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.29 : 1,080.87 = 451.69 : x
  2. Step 2: Convert to fraction form
    783.29/1,080.87 = 451.69/x
  3. Step 3: Cross multiply
    783.29x = 1,080.87 × 451.69
  4. Step 4: Simplify right side
    783.29x = 488,218.17
  5. Step 5: Solve for x
    x = 488,218.17/783.29
  6. Step 6: Final answer
    x = 623.29

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Double scale
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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.