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Finding the Fourth Proportional to 8,660.70, 12,991.80 and 2,420.76

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Solution

The fourth proportional to 8,660.70, 12,991.80 and 2,420.76 is: 3,631.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,660.70 : 12,991.80 = 2,420.76 : x
  2. Step 2: Convert to fraction form
    8,660.70/12,991.80 = 2,420.76/x
  3. Step 3: Cross multiply
    8,660.70x = 12,991.80 × 2,420.76
  4. Step 4: Simplify right side
    8,660.70x = 31,450,029.77
  5. Step 5: Solve for x
    x = 31,450,029.77/8,660.70
  6. Step 6: Final answer
    x = 3,631.35

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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.