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Finding the Fourth Proportional to 782.71, 1,179.44 and 648.76

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Solution

The fourth proportional to 782.71, 1,179.44 and 648.76 is: 977.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.71 : 1,179.44 = 648.76 : x
  2. Step 2: Convert to fraction form
    782.71/1,179.44 = 648.76/x
  3. Step 3: Cross multiply
    782.71x = 1,179.44 × 648.76
  4. Step 4: Simplify right side
    782.71x = 765,173.49
  5. Step 5: Solve for x
    x = 765,173.49/782.71
  6. Step 6: Final answer
    x = 977.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.