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Finding the Fourth Proportional to 38,672.87, 53,372.97 and 21,681.69

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Solution

The fourth proportional to 38,672.87, 53,372.97 and 21,681.69 is: 29,923.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,672.87 : 53,372.97 = 21,681.69 : x
  2. Step 2: Convert to fraction form
    38,672.87/53,372.97 = 21,681.69/x
  3. Step 3: Cross multiply
    38,672.87x = 53,372.97 × 21,681.69
  4. Step 4: Simplify right side
    38,672.87x = 1,157,216,189.92
  5. Step 5: Solve for x
    x = 1,157,216,189.92/38,672.87
  6. Step 6: Final answer
    x = 29,923.21

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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.