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Finding the Fourth Proportional to 60,831.40, 91,247.31 and 18,711.20

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Solution

The fourth proportional to 60,831.40, 91,247.31 and 18,711.20 is: 28,066.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,831.40 : 91,247.31 = 18,711.20 : x
  2. Step 2: Convert to fraction form
    60,831.40/91,247.31 = 18,711.20/x
  3. Step 3: Cross multiply
    60,831.40x = 91,247.31 × 18,711.20
  4. Step 4: Simplify right side
    60,831.40x = 1,707,346,622.98
  5. Step 5: Solve for x
    x = 1,707,346,622.98/60,831.40
  6. Step 6: Final answer
    x = 28,066.86

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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.