Home / 20,878.23-28,812.05-11,318.28

Finding the Fourth Proportional to 20,878.23, 28,812.05 and 11,318.28

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Solution

The fourth proportional to 20,878.23, 28,812.05 and 11,318.28 is: 15,619.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.23 : 28,812.05 = 11,318.28 : x
  2. Step 2: Convert to fraction form
    20,878.23/28,812.05 = 11,318.28/x
  3. Step 3: Cross multiply
    20,878.23x = 28,812.05 × 11,318.28
  4. Step 4: Simplify right side
    20,878.23x = 326,102,849.27
  5. Step 5: Solve for x
    x = 326,102,849.27/20,878.23
  6. Step 6: Final answer
    x = 15,619.28

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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.