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Finding the Fourth Proportional to 38,490.31, 57,735.42 and 20,923.21

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Solution

The fourth proportional to 38,490.31, 57,735.42 and 20,923.21 is: 31,384.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,490.31 : 57,735.42 = 20,923.21 : x
  2. Step 2: Convert to fraction form
    38,490.31/57,735.42 = 20,923.21/x
  3. Step 3: Cross multiply
    38,490.31x = 57,735.42 × 20,923.21
  4. Step 4: Simplify right side
    38,490.31x = 1,208,010,317.10
  5. Step 5: Solve for x
    x = 1,208,010,317.10/38,490.31
  6. Step 6: Final answer
    x = 31,384.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.