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Finding the Fourth Proportional to 72,245.88, 99,699.40 and 39,981.84

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Solution

The fourth proportional to 72,245.88, 99,699.40 and 39,981.84 is: 55,174.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,245.88 : 99,699.40 = 39,981.84 : x
  2. Step 2: Convert to fraction form
    72,245.88/99,699.40 = 39,981.84/x
  3. Step 3: Cross multiply
    72,245.88x = 99,699.40 × 39,981.84
  4. Step 4: Simplify right side
    72,245.88x = 3,986,165,458.90
  5. Step 5: Solve for x
    x = 3,986,165,458.90/72,245.88
  6. Step 6: Final answer
    x = 55,174.99

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1.5x scale

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.