Home / 20,989.12-28,996.80-15,674.76

Finding the Fourth Proportional to 20,989.12, 28,996.80 and 15,674.76

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Solution

The fourth proportional to 20,989.12, 28,996.80 and 15,674.76 is: 21,654.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.12 : 28,996.80 = 15,674.76 : x
  2. Step 2: Convert to fraction form
    20,989.12/28,996.80 = 15,674.76/x
  3. Step 3: Cross multiply
    20,989.12x = 28,996.80 × 15,674.76
  4. Step 4: Simplify right side
    20,989.12x = 454,517,880.77
  5. Step 5: Solve for x
    x = 454,517,880.77/20,989.12
  6. Step 6: Final answer
    x = 21,654.93

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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.