Home / 20,517.40-28,317.32-15,487.30

Finding the Fourth Proportional to 20,517.40, 28,317.32 and 15,487.30

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Solution

The fourth proportional to 20,517.40, 28,317.32 and 15,487.30 is: 21,374.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,517.40 : 28,317.32 = 15,487.30 : x
  2. Step 2: Convert to fraction form
    20,517.40/28,317.32 = 15,487.30/x
  3. Step 3: Cross multiply
    20,517.40x = 28,317.32 × 15,487.30
  4. Step 4: Simplify right side
    20,517.40x = 438,558,830.04
  5. Step 5: Solve for x
    x = 438,558,830.04/20,517.40
  6. Step 6: Final answer
    x = 21,374.97

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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.