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Finding the Fourth Proportional to 782.19, 1,078.77 and 572.13

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Solution

The fourth proportional to 782.19, 1,078.77 and 572.13 is: 789.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.19 : 1,078.77 = 572.13 : x
  2. Step 2: Convert to fraction form
    782.19/1,078.77 = 572.13/x
  3. Step 3: Cross multiply
    782.19x = 1,078.77 × 572.13
  4. Step 4: Simplify right side
    782.19x = 617,196.68
  5. Step 5: Solve for x
    x = 617,196.68/782.19
  6. Step 6: Final answer
    x = 789.06

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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.