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Finding the Fourth Proportional to 133,358.30, 183,978.64 and 87,428.97

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Solution

The fourth proportional to 133,358.30, 183,978.64 and 87,428.97 is: 120,615.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    133,358.30 : 183,978.64 = 87,428.97 : x
  2. Step 2: Convert to fraction form
    133,358.30/183,978.64 = 87,428.97/x
  3. Step 3: Cross multiply
    133,358.30x = 183,978.64 × 87,428.97
  4. Step 4: Simplify right side
    133,358.30x = 16,085,062,614.70
  5. Step 5: Solve for x
    x = 16,085,062,614.70/133,358.30
  6. Step 6: Final answer
    x = 120,615.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.