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Finding the Fourth Proportional to 72,915, 100,622.72 and 39,381

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Solution

The fourth proportional to 72,915, 100,622.72 and 39,381 is: 54,345.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,915 : 100,622.72 = 39,381 : x
  2. Step 2: Convert to fraction form
    72,915/100,622.72 = 39,381/x
  3. Step 3: Cross multiply
    72,915x = 100,622.72 × 39,381
  4. Step 4: Simplify right side
    72,915x = 3,962,623,336.32
  5. Step 5: Solve for x
    x = 3,962,623,336.32/72,915
  6. Step 6: Final answer
    x = 54,345.79

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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.