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Finding the Fourth Proportional to 2,168.52, 2,990.64 and 1,421.76

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Solution

The fourth proportional to 2,168.52, 2,990.64 and 1,421.76 is: 1,960.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,168.52 : 2,990.64 = 1,421.76 : x
  2. Step 2: Convert to fraction form
    2,168.52/2,990.64 = 1,421.76/x
  3. Step 3: Cross multiply
    2,168.52x = 2,990.64 × 1,421.76
  4. Step 4: Simplify right side
    2,168.52x = 4,251,972.33
  5. Step 5: Solve for x
    x = 4,251,972.33/2,168.52
  6. Step 6: Final answer
    x = 1,960.77

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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.