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Finding the Fourth Proportional to 11,887.60, 17,831.40 and 3,123.40

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Solution

The fourth proportional to 11,887.60, 17,831.40 and 3,123.40 is: 4,685.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,887.60 : 17,831.40 = 3,123.40 : x
  2. Step 2: Convert to fraction form
    11,887.60/17,831.40 = 3,123.40/x
  3. Step 3: Cross multiply
    11,887.60x = 17,831.40 × 3,123.40
  4. Step 4: Simplify right side
    11,887.60x = 55,694,594.76
  5. Step 5: Solve for x
    x = 55,694,594.76/11,887.60
  6. Step 6: Final answer
    x = 4,685.10

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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.