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Finding the Fourth Proportional to 986.54, 1,478.88 and 438.42

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Solution

The fourth proportional to 986.54, 1,478.88 and 438.42 is: 657.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.54 : 1,478.88 = 438.42 : x
  2. Step 2: Convert to fraction form
    986.54/1,478.88 = 438.42/x
  3. Step 3: Cross multiply
    986.54x = 1,478.88 × 438.42
  4. Step 4: Simplify right side
    986.54x = 648,370.57
  5. Step 5: Solve for x
    x = 648,370.57/986.54
  6. Step 6: Final answer
    x = 657.22

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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.