Home / 20,921.25-28,871.52-11,490.03

Finding the Fourth Proportional to 20,921.25, 28,871.52 and 11,490.03

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Solution

The fourth proportional to 20,921.25, 28,871.52 and 11,490.03 is: 15,856.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.25 : 28,871.52 = 11,490.03 : x
  2. Step 2: Convert to fraction form
    20,921.25/28,871.52 = 11,490.03/x
  3. Step 3: Cross multiply
    20,921.25x = 28,871.52 × 11,490.03
  4. Step 4: Simplify right side
    20,921.25x = 331,734,630.95
  5. Step 5: Solve for x
    x = 331,734,630.95/20,921.25
  6. Step 6: Final answer
    x = 15,856.35

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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.