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Finding the Fourth Proportional to 68,073.36, 102,139.56 and 28,640.40

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Solution

The fourth proportional to 68,073.36, 102,139.56 and 28,640.40 is: 42,973.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,073.36 : 102,139.56 = 28,640.40 : x
  2. Step 2: Convert to fraction form
    68,073.36/102,139.56 = 28,640.40/x
  3. Step 3: Cross multiply
    68,073.36x = 102,139.56 × 28,640.40
  4. Step 4: Simplify right side
    68,073.36x = 2,925,317,854.22
  5. Step 5: Solve for x
    x = 2,925,317,854.22/68,073.36
  6. Step 6: Final answer
    x = 42,973.02

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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.