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Finding the Fourth Proportional to 79,620.87, 109,881.45 and 45,639.89

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Solution

The fourth proportional to 79,620.87, 109,881.45 and 45,639.89 is: 62,985.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,620.87 : 109,881.45 = 45,639.89 : x
  2. Step 2: Convert to fraction form
    79,620.87/109,881.45 = 45,639.89/x
  3. Step 3: Cross multiply
    79,620.87x = 109,881.45 × 45,639.89
  4. Step 4: Simplify right side
    79,620.87x = 5,014,976,741.63
  5. Step 5: Solve for x
    x = 5,014,976,741.63/79,620.87
  6. Step 6: Final answer
    x = 62,985.71

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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.