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Finding the Fourth Proportional to 986.76, 1,478.21 and 575.03

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Solution

The fourth proportional to 986.76, 1,478.21 and 575.03 is: 861.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.76 : 1,478.21 = 575.03 : x
  2. Step 2: Convert to fraction form
    986.76/1,478.21 = 575.03/x
  3. Step 3: Cross multiply
    986.76x = 1,478.21 × 575.03
  4. Step 4: Simplify right side
    986.76x = 850,015.10
  5. Step 5: Solve for x
    x = 850,015.10/986.76
  6. Step 6: Final answer
    x = 861.42

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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.