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Finding the Fourth Proportional to 40,900.81, 61,384.02 and 21,185

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Solution

The fourth proportional to 40,900.81, 61,384.02 and 21,185 is: 31,794.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,900.81 : 61,384.02 = 21,185 : x
  2. Step 2: Convert to fraction form
    40,900.81/61,384.02 = 21,185/x
  3. Step 3: Cross multiply
    40,900.81x = 61,384.02 × 21,185
  4. Step 4: Simplify right side
    40,900.81x = 1,300,420,463.70
  5. Step 5: Solve for x
    x = 1,300,420,463.70/40,900.81
  6. Step 6: Final answer
    x = 31,794.49

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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.