Home / 39,990.78-59,989.36-13,695.75

Finding the Fourth Proportional to 39,990.78, 59,989.36 and 13,695.75

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Solution

The fourth proportional to 39,990.78, 59,989.36 and 13,695.75 is: 20,544.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,990.78 : 59,989.36 = 13,695.75 : x
  2. Step 2: Convert to fraction form
    39,990.78/59,989.36 = 13,695.75/x
  3. Step 3: Cross multiply
    39,990.78x = 59,989.36 × 13,695.75
  4. Step 4: Simplify right side
    39,990.78x = 821,599,268.66
  5. Step 5: Solve for x
    x = 821,599,268.66/39,990.78
  6. Step 6: Final answer
    x = 20,544.72

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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.