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Finding the Fourth Proportional to 20,681.80, 28,541.40 and 11,250.40

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Solution

The fourth proportional to 20,681.80, 28,541.40 and 11,250.40 is: 15,525.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.80 : 28,541.40 = 11,250.40 : x
  2. Step 2: Convert to fraction form
    20,681.80/28,541.40 = 11,250.40/x
  3. Step 3: Cross multiply
    20,681.80x = 28,541.40 × 11,250.40
  4. Step 4: Simplify right side
    20,681.80x = 321,102,166.56
  5. Step 5: Solve for x
    x = 321,102,166.56/20,681.80
  6. Step 6: Final answer
    x = 15,525.83

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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.