Home / 20,643.40-28,487.58-11,211.88

Finding the Fourth Proportional to 20,643.40, 28,487.58 and 11,211.88

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Solution

The fourth proportional to 20,643.40, 28,487.58 and 11,211.88 is: 15,472.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.40 : 28,487.58 = 11,211.88 : x
  2. Step 2: Convert to fraction form
    20,643.40/28,487.58 = 11,211.88/x
  3. Step 3: Cross multiply
    20,643.40x = 28,487.58 × 11,211.88
  4. Step 4: Simplify right side
    20,643.40x = 319,399,328.45
  5. Step 5: Solve for x
    x = 319,399,328.45/20,643.40
  6. Step 6: Final answer
    x = 15,472.22

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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.