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Finding the Fourth Proportional to 15,831.81, 21,847.98 and 8,758.48

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Solution

The fourth proportional to 15,831.81, 21,847.98 and 8,758.48 is: 12,086.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,831.81 : 21,847.98 = 8,758.48 : x
  2. Step 2: Convert to fraction form
    15,831.81/21,847.98 = 8,758.48/x
  3. Step 3: Cross multiply
    15,831.81x = 21,847.98 × 8,758.48
  4. Step 4: Simplify right side
    15,831.81x = 191,355,095.87
  5. Step 5: Solve for x
    x = 191,355,095.87/15,831.81
  6. Step 6: Final answer
    x = 12,086.75

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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.