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Finding the Fourth Proportional to 20,686.56, 28,552.56 and 13,230.24

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Solution

The fourth proportional to 20,686.56, 28,552.56 and 13,230.24 is: 18,261.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,686.56 : 28,552.56 = 13,230.24 : x
  2. Step 2: Convert to fraction form
    20,686.56/28,552.56 = 13,230.24/x
  3. Step 3: Cross multiply
    20,686.56x = 28,552.56 × 13,230.24
  4. Step 4: Simplify right side
    20,686.56x = 377,757,221.41
  5. Step 5: Solve for x
    x = 377,757,221.41/20,686.56
  6. Step 6: Final answer
    x = 18,261.00

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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.