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Finding the Fourth Proportional to 986.67, 1,479.60 and 438.66

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Solution

The fourth proportional to 986.67, 1,479.60 and 438.66 is: 657.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.67 : 1,479.60 = 438.66 : x
  2. Step 2: Convert to fraction form
    986.67/1,479.60 = 438.66/x
  3. Step 3: Cross multiply
    986.67x = 1,479.60 × 438.66
  4. Step 4: Simplify right side
    986.67x = 649,041.34
  5. Step 5: Solve for x
    x = 649,041.34/986.67
  6. Step 6: Final answer
    x = 657.81

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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.