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Finding the Fourth Proportional to 986.51, 1,479.90 and 438.68

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Solution

The fourth proportional to 986.51, 1,479.90 and 438.68 is: 658.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.51 : 1,479.90 = 438.68 : x
  2. Step 2: Convert to fraction form
    986.51/1,479.90 = 438.68/x
  3. Step 3: Cross multiply
    986.51x = 1,479.90 × 438.68
  4. Step 4: Simplify right side
    986.51x = 649,195.13
  5. Step 5: Solve for x
    x = 649,195.13/986.51
  6. Step 6: Final answer
    x = 658.08

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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.