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Finding the Fourth Proportional to 988.87, 1,481.07 and 577.39

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Solution

The fourth proportional to 988.87, 1,481.07 and 577.39 is: 864.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.87 : 1,481.07 = 577.39 : x
  2. Step 2: Convert to fraction form
    988.87/1,481.07 = 577.39/x
  3. Step 3: Cross multiply
    988.87x = 1,481.07 × 577.39
  4. Step 4: Simplify right side
    988.87x = 855,155.01
  5. Step 5: Solve for x
    x = 855,155.01/988.87
  6. Step 6: Final answer
    x = 864.78

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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.