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Finding the Fourth Proportional to 143,440.96, 197,955.84 and 79,780

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Solution

The fourth proportional to 143,440.96, 197,955.84 and 79,780 is: 110,100.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,440.96 : 197,955.84 = 79,780 : x
  2. Step 2: Convert to fraction form
    143,440.96/197,955.84 = 79,780/x
  3. Step 3: Cross multiply
    143,440.96x = 197,955.84 × 79,780
  4. Step 4: Simplify right side
    143,440.96x = 15,792,916,915.20
  5. Step 5: Solve for x
    x = 15,792,916,915.20/143,440.96
  6. Step 6: Final answer
    x = 110,100.47

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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.