Home / 13,904.81-20,840.79-5,129.48

Finding the Fourth Proportional to 13,904.81, 20,840.79 and 5,129.48

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Solution

The fourth proportional to 13,904.81, 20,840.79 and 5,129.48 is: 7,688.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,904.81 : 20,840.79 = 5,129.48 : x
  2. Step 2: Convert to fraction form
    13,904.81/20,840.79 = 5,129.48/x
  3. Step 3: Cross multiply
    13,904.81x = 20,840.79 × 5,129.48
  4. Step 4: Simplify right side
    13,904.81x = 106,902,369.60
  5. Step 5: Solve for x
    x = 106,902,369.60/13,904.81
  6. Step 6: Final answer
    x = 7,688.16

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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.