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Finding the Fourth Proportional to 131,428.40, 197,239.80 and 87,040.40

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Solution

The fourth proportional to 131,428.40, 197,239.80 and 87,040.40 is: 130,624.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,428.40 : 197,239.80 = 87,040.40 : x
  2. Step 2: Convert to fraction form
    131,428.40/197,239.80 = 87,040.40/x
  3. Step 3: Cross multiply
    131,428.40x = 197,239.80 × 87,040.40
  4. Step 4: Simplify right side
    131,428.40x = 17,167,831,087.92
  5. Step 5: Solve for x
    x = 17,167,831,087.92/131,428.40
  6. Step 6: Final answer
    x = 130,624.97

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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.