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Finding the Fourth Proportional to 2,103.20, 2,902.20 and 1,218.90

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Solution

The fourth proportional to 2,103.20, 2,902.20 and 1,218.90 is: 1,681.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,103.20 : 2,902.20 = 1,218.90 : x
  2. Step 2: Convert to fraction form
    2,103.20/2,902.20 = 1,218.90/x
  3. Step 3: Cross multiply
    2,103.20x = 2,902.20 × 1,218.90
  4. Step 4: Simplify right side
    2,103.20x = 3,537,491.58
  5. Step 5: Solve for x
    x = 3,537,491.58/2,103.20
  6. Step 6: Final answer
    x = 1,681.96

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1.5x scale

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.