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Finding the Fourth Proportional to 20,561.61, 28,375 and 11,130.16

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Solution

The fourth proportional to 20,561.61, 28,375 and 11,130.16 is: 15,359.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.61 : 28,375 = 11,130.16 : x
  2. Step 2: Convert to fraction form
    20,561.61/28,375 = 11,130.16/x
  3. Step 3: Cross multiply
    20,561.61x = 28,375 × 11,130.16
  4. Step 4: Simplify right side
    20,561.61x = 315,818,290
  5. Step 5: Solve for x
    x = 315,818,290/20,561.61
  6. Step 6: Final answer
    x = 15,359.61

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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.