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Finding the Fourth Proportional to 72,945.51, 100,664.82 and 39,411.51

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Solution

The fourth proportional to 72,945.51, 100,664.82 and 39,411.51 is: 54,387.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,945.51 : 100,664.82 = 39,411.51 : x
  2. Step 2: Convert to fraction form
    72,945.51/100,664.82 = 39,411.51/x
  3. Step 3: Cross multiply
    72,945.51x = 100,664.82 × 39,411.51
  4. Step 4: Simplify right side
    72,945.51x = 3,967,352,560.08
  5. Step 5: Solve for x
    x = 3,967,352,560.08/72,945.51
  6. Step 6: Final answer
    x = 54,387.89

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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.