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Finding the Fourth Proportional to 650.76, 978.38 and 515.48

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Solution

The fourth proportional to 650.76, 978.38 and 515.48 is: 774.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    650.76 : 978.38 = 515.48 : x
  2. Step 2: Convert to fraction form
    650.76/978.38 = 515.48/x
  3. Step 3: Cross multiply
    650.76x = 978.38 × 515.48
  4. Step 4: Simplify right side
    650.76x = 504,335.32
  5. Step 5: Solve for x
    x = 504,335.32/650.76
  6. Step 6: Final answer
    x = 774.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.