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Finding the Fourth Proportional to 783.69, 1,080.25 and 617.64

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Solution

The fourth proportional to 783.69, 1,080.25 and 617.64 is: 851.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.69 : 1,080.25 = 617.64 : x
  2. Step 2: Convert to fraction form
    783.69/1,080.25 = 617.64/x
  3. Step 3: Cross multiply
    783.69x = 1,080.25 × 617.64
  4. Step 4: Simplify right side
    783.69x = 667,205.61
  5. Step 5: Solve for x
    x = 667,205.61/783.69
  6. Step 6: Final answer
    x = 851.36

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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.