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Finding the Fourth Proportional to 15,704.80, 21,671.74 and 8,990.10

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Solution

The fourth proportional to 15,704.80, 21,671.74 and 8,990.10 is: 12,405.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,704.80 : 21,671.74 = 8,990.10 : x
  2. Step 2: Convert to fraction form
    15,704.80/21,671.74 = 8,990.10/x
  3. Step 3: Cross multiply
    15,704.80x = 21,671.74 × 8,990.10
  4. Step 4: Simplify right side
    15,704.80x = 194,831,109.77
  5. Step 5: Solve for x
    x = 194,831,109.77/15,704.80
  6. Step 6: Final answer
    x = 12,405.83

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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.