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Finding the Fourth Proportional to 68,810.70, 103,207.80 and 21,429.20

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Solution

The fourth proportional to 68,810.70, 103,207.80 and 21,429.20 is: 32,141.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,810.70 : 103,207.80 = 21,429.20 : x
  2. Step 2: Convert to fraction form
    68,810.70/103,207.80 = 21,429.20/x
  3. Step 3: Cross multiply
    68,810.70x = 103,207.80 × 21,429.20
  4. Step 4: Simplify right side
    68,810.70x = 2,211,660,587.76
  5. Step 5: Solve for x
    x = 2,211,660,587.76/68,810.70
  6. Step 6: Final answer
    x = 32,141.23

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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.