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Finding the Fourth Proportional to 68,030.40, 102,055.20 and 21,278.40

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Solution

The fourth proportional to 68,030.40, 102,055.20 and 21,278.40 is: 31,920.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,030.40 : 102,055.20 = 21,278.40 : x
  2. Step 2: Convert to fraction form
    68,030.40/102,055.20 = 21,278.40/x
  3. Step 3: Cross multiply
    68,030.40x = 102,055.20 × 21,278.40
  4. Step 4: Simplify right side
    68,030.40x = 2,171,571,367.68
  5. Step 5: Solve for x
    x = 2,171,571,367.68/68,030.40
  6. Step 6: Final answer
    x = 31,920.60

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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.