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Finding the Fourth Proportional to 64,990.49, 97,489.19 and 20,620.71

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Solution

The fourth proportional to 64,990.49, 97,489.19 and 20,620.71 is: 30,932.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,990.49 : 97,489.19 = 20,620.71 : x
  2. Step 2: Convert to fraction form
    64,990.49/97,489.19 = 20,620.71/x
  3. Step 3: Cross multiply
    64,990.49x = 97,489.19 × 20,620.71
  4. Step 4: Simplify right side
    64,990.49x = 2,010,296,212.02
  5. Step 5: Solve for x
    x = 2,010,296,212.02/64,990.49
  6. Step 6: Final answer
    x = 30,932.16

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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.