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Finding the Fourth Proportional to 15,505.91, 21,399.96 and 8,701.81

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Solution

The fourth proportional to 15,505.91, 21,399.96 and 8,701.81 is: 12,009.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,505.91 : 21,399.96 = 8,701.81 : x
  2. Step 2: Convert to fraction form
    15,505.91/21,399.96 = 8,701.81/x
  3. Step 3: Cross multiply
    15,505.91x = 21,399.96 × 8,701.81
  4. Step 4: Simplify right side
    15,505.91x = 186,218,385.93
  5. Step 5: Solve for x
    x = 186,218,385.93/15,505.91
  6. Step 6: Final answer
    x = 12,009.51

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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.