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Finding the Fourth Proportional to 72,930.98, 109,317.20 and 47,988.25

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Solution

The fourth proportional to 72,930.98, 109,317.20 and 47,988.25 is: 71,930.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,930.98 : 109,317.20 = 47,988.25 : x
  2. Step 2: Convert to fraction form
    72,930.98/109,317.20 = 47,988.25/x
  3. Step 3: Cross multiply
    72,930.98x = 109,317.20 × 47,988.25
  4. Step 4: Simplify right side
    72,930.98x = 5,245,940,609.67
  5. Step 5: Solve for x
    x = 5,245,940,609.67/72,930.98
  6. Step 6: Final answer
    x = 71,930.21

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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.