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Finding the Fourth Proportional to 72,483.70, 108,720.66 and 19,888.78

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Solution

The fourth proportional to 72,483.70, 108,720.66 and 19,888.78 is: 29,831.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,483.70 : 108,720.66 = 19,888.78 : x
  2. Step 2: Convert to fraction form
    72,483.70/108,720.66 = 19,888.78/x
  3. Step 3: Cross multiply
    72,483.70x = 108,720.66 × 19,888.78
  4. Step 4: Simplify right side
    72,483.70x = 2,162,321,288.19
  5. Step 5: Solve for x
    x = 2,162,321,288.19/72,483.70
  6. Step 6: Final answer
    x = 29,831.83

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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.