Home / 39,405.19-54,378.42-21,499.75

Finding the Fourth Proportional to 39,405.19, 54,378.42 and 21,499.75

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Solution

The fourth proportional to 39,405.19, 54,378.42 and 21,499.75 is: 29,669.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,405.19 : 54,378.42 = 21,499.75 : x
  2. Step 2: Convert to fraction form
    39,405.19/54,378.42 = 21,499.75/x
  3. Step 3: Cross multiply
    39,405.19x = 54,378.42 × 21,499.75
  4. Step 4: Simplify right side
    39,405.19x = 1,169,122,435.40
  5. Step 5: Solve for x
    x = 1,169,122,435.40/39,405.19
  6. Step 6: Final answer
    x = 29,669.25

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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.