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Finding the Fourth Proportional to 72,925, 100,636.54 and 39,391

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Solution

The fourth proportional to 72,925, 100,636.54 and 39,391 is: 54,359.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,925 : 100,636.54 = 39,391 : x
  2. Step 2: Convert to fraction form
    72,925/100,636.54 = 39,391/x
  3. Step 3: Cross multiply
    72,925x = 100,636.54 × 39,391
  4. Step 4: Simplify right side
    72,925x = 3,964,173,947.14
  5. Step 5: Solve for x
    x = 3,964,173,947.14/72,925
  6. Step 6: Final answer
    x = 54,359.60

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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.