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Finding the Fourth Proportional to 3,868.88, 5,339.02 and 2,100.40

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Solution

The fourth proportional to 3,868.88, 5,339.02 and 2,100.40 is: 2,898.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,868.88 : 5,339.02 = 2,100.40 : x
  2. Step 2: Convert to fraction form
    3,868.88/5,339.02 = 2,100.40/x
  3. Step 3: Cross multiply
    3,868.88x = 5,339.02 × 2,100.40
  4. Step 4: Simplify right side
    3,868.88x = 11,214,077.61
  5. Step 5: Solve for x
    x = 11,214,077.61/3,868.88
  6. Step 6: Final answer
    x = 2,898.53

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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.