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Finding the Fourth Proportional to 18,871.90, 28,307.77 and 4,831.90

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Solution

The fourth proportional to 18,871.90, 28,307.77 and 4,831.90 is: 7,247.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.90 : 28,307.77 = 4,831.90 : x
  2. Step 2: Convert to fraction form
    18,871.90/28,307.77 = 4,831.90/x
  3. Step 3: Cross multiply
    18,871.90x = 28,307.77 × 4,831.90
  4. Step 4: Simplify right side
    18,871.90x = 136,780,313.86
  5. Step 5: Solve for x
    x = 136,780,313.86/18,871.90
  6. Step 6: Final answer
    x = 7,247.83

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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.