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Finding the Fourth Proportional to 143,161.72, 197,558.94 and 78,631.72

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Solution

The fourth proportional to 143,161.72, 197,558.94 and 78,631.72 is: 108,509.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,161.72 : 197,558.94 = 78,631.72 : x
  2. Step 2: Convert to fraction form
    143,161.72/197,558.94 = 78,631.72/x
  3. Step 3: Cross multiply
    143,161.72x = 197,558.94 × 78,631.72
  4. Step 4: Simplify right side
    143,161.72x = 15,534,399,253.58
  5. Step 5: Solve for x
    x = 15,534,399,253.58/143,161.72
  6. Step 6: Final answer
    x = 108,509.45

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1.5x scale

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.