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Finding the Fourth Proportional to 984.96, 1,478.79 and 618.66

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Solution

The fourth proportional to 984.96, 1,478.79 and 618.66 is: 928.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.96 : 1,478.79 = 618.66 : x
  2. Step 2: Convert to fraction form
    984.96/1,478.79 = 618.66/x
  3. Step 3: Cross multiply
    984.96x = 1,478.79 × 618.66
  4. Step 4: Simplify right side
    984.96x = 914,868.22
  5. Step 5: Solve for x
    x = 914,868.22/984.96
  6. Step 6: Final answer
    x = 928.84

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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.