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Finding the Fourth Proportional to 987.95, 1,481.43 and 577.90

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Solution

The fourth proportional to 987.95, 1,481.43 and 577.90 is: 866.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.95 : 1,481.43 = 577.90 : x
  2. Step 2: Convert to fraction form
    987.95/1,481.43 = 577.90/x
  3. Step 3: Cross multiply
    987.95x = 1,481.43 × 577.90
  4. Step 4: Simplify right side
    987.95x = 856,110.99
  5. Step 5: Solve for x
    x = 856,110.99/987.95
  6. Step 6: Final answer
    x = 866.55

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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.