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Finding the Fourth Proportional to 68,712.40, 103,008.60 and 26,621.20

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Solution

The fourth proportional to 68,712.40, 103,008.60 and 26,621.20 is: 39,908.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,712.40 : 103,008.60 = 26,621.20 : x
  2. Step 2: Convert to fraction form
    68,712.40/103,008.60 = 26,621.20/x
  3. Step 3: Cross multiply
    68,712.40x = 103,008.60 × 26,621.20
  4. Step 4: Simplify right side
    68,712.40x = 2,742,212,542.32
  5. Step 5: Solve for x
    x = 2,742,212,542.32/68,712.40
  6. Step 6: Final answer
    x = 39,908.55

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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.