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Finding the Fourth Proportional to 76,143.37, 105,029.11 and 61,072.20

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Solution

The fourth proportional to 76,143.37, 105,029.11 and 61,072.20 is: 84,240.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,143.37 : 105,029.11 = 61,072.20 : x
  2. Step 2: Convert to fraction form
    76,143.37/105,029.11 = 61,072.20/x
  3. Step 3: Cross multiply
    76,143.37x = 105,029.11 × 61,072.20
  4. Step 4: Simplify right side
    76,143.37x = 6,414,358,811.74
  5. Step 5: Solve for x
    x = 6,414,358,811.74/76,143.37
  6. Step 6: Final answer
    x = 84,240.54

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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.