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Finding the Fourth Proportional to 68,913, 103,376.66 and 18,993.11

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Solution

The fourth proportional to 68,913, 103,376.66 and 18,993.11 is: 28,491.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,913 : 103,376.66 = 18,993.11 : x
  2. Step 2: Convert to fraction form
    68,913/103,376.66 = 18,993.11/x
  3. Step 3: Cross multiply
    68,913x = 103,376.66 × 18,993.11
  4. Step 4: Simplify right side
    68,913x = 1,963,444,274.81
  5. Step 5: Solve for x
    x = 1,963,444,274.81/68,913
  6. Step 6: Final answer
    x = 28,491.64

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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.