Home / 20,990.14-28,957.70-12,490.56

Finding the Fourth Proportional to 20,990.14, 28,957.70 and 12,490.56

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Solution

The fourth proportional to 20,990.14, 28,957.70 and 12,490.56 is: 17,231.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.14 : 28,957.70 = 12,490.56 : x
  2. Step 2: Convert to fraction form
    20,990.14/28,957.70 = 12,490.56/x
  3. Step 3: Cross multiply
    20,990.14x = 28,957.70 × 12,490.56
  4. Step 4: Simplify right side
    20,990.14x = 361,697,889.31
  5. Step 5: Solve for x
    x = 361,697,889.31/20,990.14
  6. Step 6: Final answer
    x = 17,231.80

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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.