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Finding the Fourth Proportional to 15,632.81, 21,571.28 and 8,918.05

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Solution

The fourth proportional to 15,632.81, 21,571.28 and 8,918.05 is: 12,305.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,632.81 : 21,571.28 = 8,918.05 : x
  2. Step 2: Convert to fraction form
    15,632.81/21,571.28 = 8,918.05/x
  3. Step 3: Cross multiply
    15,632.81x = 21,571.28 × 8,918.05
  4. Step 4: Simplify right side
    15,632.81x = 192,373,728.97
  5. Step 5: Solve for x
    x = 192,373,728.97/15,632.81
  6. Step 6: Final answer
    x = 12,305.76

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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.