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Finding the Fourth Proportional to 328,997.20, 493,726.20 and 142,142.80

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Solution

The fourth proportional to 328,997.20, 493,726.20 and 142,142.80 is: 213,313.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,997.20 : 493,726.20 = 142,142.80 : x
  2. Step 2: Convert to fraction form
    328,997.20/493,726.20 = 142,142.80/x
  3. Step 3: Cross multiply
    328,997.20x = 493,726.20 × 142,142.80
  4. Step 4: Simplify right side
    328,997.20x = 70,179,624,501.36
  5. Step 5: Solve for x
    x = 70,179,624,501.36/328,997.20
  6. Step 6: Final answer
    x = 213,313.74

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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.