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Finding the Fourth Proportional to 508,420.72, 762,635.44 and 129,341.80

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Solution

The fourth proportional to 508,420.72, 762,635.44 and 129,341.80 is: 194,013.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    508,420.72 : 762,635.44 = 129,341.80 : x
  2. Step 2: Convert to fraction form
    508,420.72/762,635.44 = 129,341.80/x
  3. Step 3: Cross multiply
    508,420.72x = 762,635.44 × 129,341.80
  4. Step 4: Simplify right side
    508,420.72x = 98,640,640,553.39
  5. Step 5: Solve for x
    x = 98,640,640,553.39/508,420.72
  6. Step 6: Final answer
    x = 194,013.81

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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.