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Finding the Fourth Proportional to 68,343.81, 102,518.81 and 20,955.45

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Solution

The fourth proportional to 68,343.81, 102,518.81 and 20,955.45 is: 31,434.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,343.81 : 102,518.81 = 20,955.45 : x
  2. Step 2: Convert to fraction form
    68,343.81/102,518.81 = 20,955.45/x
  3. Step 3: Cross multiply
    68,343.81x = 102,518.81 × 20,955.45
  4. Step 4: Simplify right side
    68,343.81x = 2,148,327,360.18
  5. Step 5: Solve for x
    x = 2,148,327,360.18/68,343.81
  6. Step 6: Final answer
    x = 31,434.12

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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.