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Finding the Fourth Proportional to 72,679.68, 109,020.60 and 47,878.56

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Solution

The fourth proportional to 72,679.68, 109,020.60 and 47,878.56 is: 71,818.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,679.68 : 109,020.60 = 47,878.56 : x
  2. Step 2: Convert to fraction form
    72,679.68/109,020.60 = 47,878.56/x
  3. Step 3: Cross multiply
    72,679.68x = 109,020.60 × 47,878.56
  4. Step 4: Simplify right side
    72,679.68x = 5,219,749,338.34
  5. Step 5: Solve for x
    x = 5,219,749,338.34/72,679.68
  6. Step 6: Final answer
    x = 71,818.55

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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.