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Finding the Fourth Proportional to 980.16, 1,468.78 and 613.84

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Solution

The fourth proportional to 980.16, 1,468.78 and 613.84 is: 919.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.16 : 1,468.78 = 613.84 : x
  2. Step 2: Convert to fraction form
    980.16/1,468.78 = 613.84/x
  3. Step 3: Cross multiply
    980.16x = 1,468.78 × 613.84
  4. Step 4: Simplify right side
    980.16x = 901,595.92
  5. Step 5: Solve for x
    x = 901,595.92/980.16
  6. Step 6: Final answer
    x = 919.85

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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.