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Finding the Fourth Proportional to 783.22, 1,080.55 and 517.79

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Solution

The fourth proportional to 783.22, 1,080.55 and 517.79 is: 714.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.22 : 1,080.55 = 517.79 : x
  2. Step 2: Convert to fraction form
    783.22/1,080.55 = 517.79/x
  3. Step 3: Cross multiply
    783.22x = 1,080.55 × 517.79
  4. Step 4: Simplify right side
    783.22x = 559,489.99
  5. Step 5: Solve for x
    x = 559,489.99/783.22
  6. Step 6: Final answer
    x = 714.35

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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.