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Finding the Fourth Proportional to 143,957.80, 198,661.21 and 79,431.05

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Solution

The fourth proportional to 143,957.80, 198,661.21 and 79,431.05 is: 109,614.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,957.80 : 198,661.21 = 79,431.05 : x
  2. Step 2: Convert to fraction form
    143,957.80/198,661.21 = 79,431.05/x
  3. Step 3: Cross multiply
    143,957.80x = 198,661.21 × 79,431.05
  4. Step 4: Simplify right side
    143,957.80x = 15,779,868,802.65
  5. Step 5: Solve for x
    x = 15,779,868,802.65/143,957.80
  6. Step 6: Final answer
    x = 109,614.55

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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.