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Finding the Fourth Proportional to 143,978.99, 198,689.65 and 79,448.81

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Solution

The fourth proportional to 143,978.99, 198,689.65 and 79,448.81 is: 109,638.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,978.99 : 198,689.65 = 79,448.81 : x
  2. Step 2: Convert to fraction form
    143,978.99/198,689.65 = 79,448.81/x
  3. Step 3: Cross multiply
    143,978.99x = 198,689.65 × 79,448.81
  4. Step 4: Simplify right side
    143,978.99x = 15,785,656,549.92
  5. Step 5: Solve for x
    x = 15,785,656,549.92/143,978.99
  6. Step 6: Final answer
    x = 109,638.62

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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.