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Finding the Fourth Proportional to 783.29, 1,080.99 and 488.72

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Solution

The fourth proportional to 783.29, 1,080.99 and 488.72 is: 674.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.29 : 1,080.99 = 488.72 : x
  2. Step 2: Convert to fraction form
    783.29/1,080.99 = 488.72/x
  3. Step 3: Cross multiply
    783.29x = 1,080.99 × 488.72
  4. Step 4: Simplify right side
    783.29x = 528,296.03
  5. Step 5: Solve for x
    x = 528,296.03/783.29
  6. Step 6: Final answer
    x = 674.46

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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.