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Finding the Fourth Proportional to 72,872.25, 100,607.45 and 47,765.49

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Solution

The fourth proportional to 72,872.25, 100,607.45 and 47,765.49 is: 65,945.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,872.25 : 100,607.45 = 47,765.49 : x
  2. Step 2: Convert to fraction form
    72,872.25/100,607.45 = 47,765.49/x
  3. Step 3: Cross multiply
    72,872.25x = 100,607.45 × 47,765.49
  4. Step 4: Simplify right side
    72,872.25x = 4,805,563,908.07
  5. Step 5: Solve for x
    x = 4,805,563,908.07/72,872.25
  6. Step 6: Final answer
    x = 65,945.05

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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.