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Finding the Fourth Proportional to 143,278.80, 197,715.70 and 79,612.80

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Solution

The fourth proportional to 143,278.80, 197,715.70 and 79,612.80 is: 109,860.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,278.80 : 197,715.70 = 79,612.80 : x
  2. Step 2: Convert to fraction form
    143,278.80/197,715.70 = 79,612.80/x
  3. Step 3: Cross multiply
    143,278.80x = 197,715.70 × 79,612.80
  4. Step 4: Simplify right side
    143,278.80x = 15,740,700,480.96
  5. Step 5: Solve for x
    x = 15,740,700,480.96/143,278.80
  6. Step 6: Final answer
    x = 109,860.64

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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.