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Finding the Fourth Proportional to 84,872.45, 127,245.80 and 42,721.67

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Solution

The fourth proportional to 84,872.45, 127,245.80 and 42,721.67 is: 64,050.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,872.45 : 127,245.80 = 42,721.67 : x
  2. Step 2: Convert to fraction form
    84,872.45/127,245.80 = 42,721.67/x
  3. Step 3: Cross multiply
    84,872.45x = 127,245.80 × 42,721.67
  4. Step 4: Simplify right side
    84,872.45x = 5,436,153,501.40
  5. Step 5: Solve for x
    x = 5,436,153,501.40/84,872.45
  6. Step 6: Final answer
    x = 64,050.86

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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.