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Finding the Fourth Proportional to 72,928.80, 100,641.72 and 39,394.80

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Solution

The fourth proportional to 72,928.80, 100,641.72 and 39,394.80 is: 54,364.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,928.80 : 100,641.72 = 39,394.80 : x
  2. Step 2: Convert to fraction form
    72,928.80/100,641.72 = 39,394.80/x
  3. Step 3: Cross multiply
    72,928.80x = 100,641.72 × 39,394.80
  4. Step 4: Simplify right side
    72,928.80x = 3,964,760,431.06
  5. Step 5: Solve for x
    x = 3,964,760,431.06/72,928.80
  6. Step 6: Final answer
    x = 54,364.81

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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.