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Finding the Fourth Proportional to 72,913.95, 100,621.26 and 39,379.95

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Solution

The fourth proportional to 72,913.95, 100,621.26 and 39,379.95 is: 54,344.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,913.95 : 100,621.26 = 39,379.95 : x
  2. Step 2: Convert to fraction form
    72,913.95/100,621.26 = 39,379.95/x
  3. Step 3: Cross multiply
    72,913.95x = 100,621.26 × 39,379.95
  4. Step 4: Simplify right side
    72,913.95x = 3,962,460,187.74
  5. Step 5: Solve for x
    x = 3,962,460,187.74/72,913.95
  6. Step 6: Final answer
    x = 54,344.34

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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.