Home / 21,007.81-28,990.20-11,576.17

Finding the Fourth Proportional to 21,007.81, 28,990.20 and 11,576.17

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Solution

The fourth proportional to 21,007.81, 28,990.20 and 11,576.17 is: 15,974.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.81 : 28,990.20 = 11,576.17 : x
  2. Step 2: Convert to fraction form
    21,007.81/28,990.20 = 11,576.17/x
  3. Step 3: Cross multiply
    21,007.81x = 28,990.20 × 11,576.17
  4. Step 4: Simplify right side
    21,007.81x = 335,595,483.53
  5. Step 5: Solve for x
    x = 335,595,483.53/21,007.81
  6. Step 6: Final answer
    x = 15,974.80

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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.