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Finding the Fourth Proportional to 143,165.58, 197,570.85 and 78,640.77

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Solution

The fourth proportional to 143,165.58, 197,570.85 and 78,640.77 is: 108,525.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,165.58 : 197,570.85 = 78,640.77 : x
  2. Step 2: Convert to fraction form
    143,165.58/197,570.85 = 78,640.77/x
  3. Step 3: Cross multiply
    143,165.58x = 197,570.85 × 78,640.77
  4. Step 4: Simplify right side
    143,165.58x = 15,537,124,219.54
  5. Step 5: Solve for x
    x = 15,537,124,219.54/143,165.58
  6. Step 6: Final answer
    x = 108,525.56

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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.