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Finding the Fourth Proportional to 138,428.40, 207,631.80 and 54,172.20

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Solution

The fourth proportional to 138,428.40, 207,631.80 and 54,172.20 is: 81,254.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,428.40 : 207,631.80 = 54,172.20 : x
  2. Step 2: Convert to fraction form
    138,428.40/207,631.80 = 54,172.20/x
  3. Step 3: Cross multiply
    138,428.40x = 207,631.80 × 54,172.20
  4. Step 4: Simplify right side
    138,428.40x = 11,247,871,395.96
  5. Step 5: Solve for x
    x = 11,247,871,395.96/138,428.40
  6. Step 6: Final answer
    x = 81,254.07

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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.