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Finding the Fourth Proportional to 72,246.99, 99,699.35 and 39,981.60

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Solution

The fourth proportional to 72,246.99, 99,699.35 and 39,981.60 is: 55,173.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,246.99 : 99,699.35 = 39,981.60 : x
  2. Step 2: Convert to fraction form
    72,246.99/99,699.35 = 39,981.60/x
  3. Step 3: Cross multiply
    72,246.99x = 99,699.35 × 39,981.60
  4. Step 4: Simplify right side
    72,246.99x = 3,986,139,531.96
  5. Step 5: Solve for x
    x = 3,986,139,531.96/72,246.99
  6. Step 6: Final answer
    x = 55,173.78

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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.