Home / 138,921.40-208,301.64-122,314.78

Finding the Fourth Proportional to 138,921.40, 208,301.64 and 122,314.78

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Solution

The fourth proportional to 138,921.40, 208,301.64 and 122,314.78 is: 183,401.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,921.40 : 208,301.64 = 122,314.78 : x
  2. Step 2: Convert to fraction form
    138,921.40/208,301.64 = 122,314.78/x
  3. Step 3: Cross multiply
    138,921.40x = 208,301.64 × 122,314.78
  4. Step 4: Simplify right side
    138,921.40x = 25,478,369,270.24
  5. Step 5: Solve for x
    x = 25,478,369,270.24/138,921.40
  6. Step 6: Final answer
    x = 183,401.33

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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.