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Finding the Fourth Proportional to 13,571.80, 20,357.59 and 8,921.18

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Solution

The fourth proportional to 13,571.80, 20,357.59 and 8,921.18 is: 13,381.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,571.80 : 20,357.59 = 8,921.18 : x
  2. Step 2: Convert to fraction form
    13,571.80/20,357.59 = 8,921.18/x
  3. Step 3: Cross multiply
    13,571.80x = 20,357.59 × 8,921.18
  4. Step 4: Simplify right side
    13,571.80x = 181,613,724.76
  5. Step 5: Solve for x
    x = 181,613,724.76/13,571.80
  6. Step 6: Final answer
    x = 13,381.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.