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Finding the Fourth Proportional to 84,621.21, 126,807.03 and 47,129.64

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Solution

The fourth proportional to 84,621.21, 126,807.03 and 47,129.64 is: 70,624.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,621.21 : 126,807.03 = 47,129.64 : x
  2. Step 2: Convert to fraction form
    84,621.21/126,807.03 = 47,129.64/x
  3. Step 3: Cross multiply
    84,621.21x = 126,807.03 × 47,129.64
  4. Step 4: Simplify right side
    84,621.21x = 5,976,369,673.37
  5. Step 5: Solve for x
    x = 5,976,369,673.37/84,621.21
  6. Step 6: Final answer
    x = 70,624.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.