Home / 20,643.85-28,488.05-11,212.21

Finding the Fourth Proportional to 20,643.85, 28,488.05 and 11,212.21

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Solution

The fourth proportional to 20,643.85, 28,488.05 and 11,212.21 is: 15,472.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.85 : 28,488.05 = 11,212.21 : x
  2. Step 2: Convert to fraction form
    20,643.85/28,488.05 = 11,212.21/x
  3. Step 3: Cross multiply
    20,643.85x = 28,488.05 × 11,212.21
  4. Step 4: Simplify right side
    20,643.85x = 319,413,943.03
  5. Step 5: Solve for x
    x = 319,413,943.03/20,643.85
  6. Step 6: Final answer
    x = 15,472.60

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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.