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Finding the Fourth Proportional to 783, 1,080.50 and 517.56

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Solution

The fourth proportional to 783, 1,080.50 and 517.56 is: 714.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    783 : 1,080.50 = 517.56 : x
  2. Step 2: Convert to fraction form
    783/1,080.50 = 517.56/x
  3. Step 3: Cross multiply
    783x = 1,080.50 × 517.56
  4. Step 4: Simplify right side
    783x = 559,223.58
  5. Step 5: Solve for x
    x = 559,223.58/783
  6. Step 6: Final answer
    x = 714.21

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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.