Home / 20,975.10-28,945.94-11,415.30

Finding the Fourth Proportional to 20,975.10, 28,945.94 and 11,415.30

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Solution

The fourth proportional to 20,975.10, 28,945.94 and 11,415.30 is: 15,753.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,975.10 : 28,945.94 = 11,415.30 : x
  2. Step 2: Convert to fraction form
    20,975.10/28,945.94 = 11,415.30/x
  3. Step 3: Cross multiply
    20,975.10x = 28,945.94 × 11,415.30
  4. Step 4: Simplify right side
    20,975.10x = 330,426,531.81
  5. Step 5: Solve for x
    x = 330,426,531.81/20,975.10
  6. Step 6: Final answer
    x = 15,753.28

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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.