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Finding the Fourth Proportional to 2,989.86, 4,125.99 and 1,663.86

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Solution

The fourth proportional to 2,989.86, 4,125.99 and 1,663.86 is: 2,296.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,989.86 : 4,125.99 = 1,663.86 : x
  2. Step 2: Convert to fraction form
    2,989.86/4,125.99 = 1,663.86/x
  3. Step 3: Cross multiply
    2,989.86x = 4,125.99 × 1,663.86
  4. Step 4: Simplify right side
    2,989.86x = 6,865,069.72
  5. Step 5: Solve for x
    x = 6,865,069.72/2,989.86
  6. Step 6: Final answer
    x = 2,296.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.