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Finding the Fourth Proportional to 72,986.60, 100,721.46 and 39,452.60

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Solution

The fourth proportional to 72,986.60, 100,721.46 and 39,452.60 is: 54,444.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,986.60 : 100,721.46 = 39,452.60 : x
  2. Step 2: Convert to fraction form
    72,986.60/100,721.46 = 39,452.60/x
  3. Step 3: Cross multiply
    72,986.60x = 100,721.46 × 39,452.60
  4. Step 4: Simplify right side
    72,986.60x = 3,973,723,472.80
  5. Step 5: Solve for x
    x = 3,973,723,472.80/72,986.60
  6. Step 6: Final answer
    x = 54,444.56

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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.