Home / 21,091.58-31,639.20-8,612.45

Finding the Fourth Proportional to 21,091.58, 31,639.20 and 8,612.45

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Solution

The fourth proportional to 21,091.58, 31,639.20 and 8,612.45 is: 12,919.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,091.58 : 31,639.20 = 8,612.45 : x
  2. Step 2: Convert to fraction form
    21,091.58/31,639.20 = 8,612.45/x
  3. Step 3: Cross multiply
    21,091.58x = 31,639.20 × 8,612.45
  4. Step 4: Simplify right side
    21,091.58x = 272,490,869.84
  5. Step 5: Solve for x
    x = 272,490,869.84/21,091.58
  6. Step 6: Final answer
    x = 12,919.42

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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.