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Finding the Fourth Proportional to 986.22, 1,479.33 and 438.40

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Solution

The fourth proportional to 986.22, 1,479.33 and 438.40 is: 657.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.22 : 1,479.33 = 438.40 : x
  2. Step 2: Convert to fraction form
    986.22/1,479.33 = 438.40/x
  3. Step 3: Cross multiply
    986.22x = 1,479.33 × 438.40
  4. Step 4: Simplify right side
    986.22x = 648,538.27
  5. Step 5: Solve for x
    x = 648,538.27/986.22
  6. Step 6: Final answer
    x = 657.60

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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.