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Finding the Fourth Proportional to 143,065.92, 197,428 and 79,400

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Solution

The fourth proportional to 143,065.92, 197,428 and 79,400 is: 109,570.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,065.92 : 197,428 = 79,400 : x
  2. Step 2: Convert to fraction form
    143,065.92/197,428 = 79,400/x
  3. Step 3: Cross multiply
    143,065.92x = 197,428 × 79,400
  4. Step 4: Simplify right side
    143,065.92x = 15,675,783,200
  5. Step 5: Solve for x
    x = 15,675,783,200/143,065.92
  6. Step 6: Final answer
    x = 109,570.35

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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.