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Finding the Fourth Proportional to 72,913.60, 100,620.71 and 39,379.60

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Solution

The fourth proportional to 72,913.60, 100,620.71 and 39,379.60 is: 54,343.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,913.60 : 100,620.71 = 39,379.60 : x
  2. Step 2: Convert to fraction form
    72,913.60/100,620.71 = 39,379.60/x
  3. Step 3: Cross multiply
    72,913.60x = 100,620.71 × 39,379.60
  4. Step 4: Simplify right side
    72,913.60x = 3,962,403,388.07
  5. Step 5: Solve for x
    x = 3,962,403,388.07/72,913.60
  6. Step 6: Final answer
    x = 54,343.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.