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Finding the Fourth Proportional to 18,690.52, 28,042.78 and 8,831.40

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Solution

The fourth proportional to 18,690.52, 28,042.78 and 8,831.40 is: 13,250.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,690.52 : 28,042.78 = 8,831.40 : x
  2. Step 2: Convert to fraction form
    18,690.52/28,042.78 = 8,831.40/x
  3. Step 3: Cross multiply
    18,690.52x = 28,042.78 × 8,831.40
  4. Step 4: Simplify right side
    18,690.52x = 247,657,007.29
  5. Step 5: Solve for x
    x = 247,657,007.29/18,690.52
  6. Step 6: Final answer
    x = 13,250.41

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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.