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Finding the Fourth Proportional to 2,108.59, 2,910 and 1,224.49

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Solution

The fourth proportional to 2,108.59, 2,910 and 1,224.49 is: 1,689.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,108.59 : 2,910 = 1,224.49 : x
  2. Step 2: Convert to fraction form
    2,108.59/2,910 = 1,224.49/x
  3. Step 3: Cross multiply
    2,108.59x = 2,910 × 1,224.49
  4. Step 4: Simplify right side
    2,108.59x = 3,563,265.90
  5. Step 5: Solve for x
    x = 3,563,265.90/2,108.59
  6. Step 6: Final answer
    x = 1,689.88

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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.