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Finding the Fourth Proportional to 72,905.25, 100,609.25 and 39,371.25

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Solution

The fourth proportional to 72,905.25, 100,609.25 and 39,371.25 is: 54,332.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,905.25 : 100,609.25 = 39,371.25 : x
  2. Step 2: Convert to fraction form
    72,905.25/100,609.25 = 39,371.25/x
  3. Step 3: Cross multiply
    72,905.25x = 100,609.25 × 39,371.25
  4. Step 4: Simplify right side
    72,905.25x = 3,961,111,934.06
  5. Step 5: Solve for x
    x = 3,961,111,934.06/72,905.25
  6. Step 6: Final answer
    x = 54,332.33

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1.5x scale

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.