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Finding the Fourth Proportional to 8,712.76, 13,069.26 and 2,139.10

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Solution

The fourth proportional to 8,712.76, 13,069.26 and 2,139.10 is: 3,208.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,712.76 : 13,069.26 = 2,139.10 : x
  2. Step 2: Convert to fraction form
    8,712.76/13,069.26 = 2,139.10/x
  3. Step 3: Cross multiply
    8,712.76x = 13,069.26 × 2,139.10
  4. Step 4: Simplify right side
    8,712.76x = 27,956,454.07
  5. Step 5: Solve for x
    x = 27,956,454.07/8,712.76
  6. Step 6: Final answer
    x = 3,208.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.