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Finding the Fourth Proportional to 990.43, 1,487.35 and 879.50

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Solution

The fourth proportional to 990.43, 1,487.35 and 879.50 is: 1,320.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.43 : 1,487.35 = 879.50 : x
  2. Step 2: Convert to fraction form
    990.43/1,487.35 = 879.50/x
  3. Step 3: Cross multiply
    990.43x = 1,487.35 × 879.50
  4. Step 4: Simplify right side
    990.43x = 1,308,119.93
  5. Step 5: Solve for x
    x = 1,308,119.93/990.43
  6. Step 6: Final answer
    x = 1,320.76

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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.