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Finding the Fourth Proportional to 68,784.22, 103,191.18 and 21,398.40

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Solution

The fourth proportional to 68,784.22, 103,191.18 and 21,398.40 is: 32,102.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,784.22 : 103,191.18 = 21,398.40 : x
  2. Step 2: Convert to fraction form
    68,784.22/103,191.18 = 21,398.40/x
  3. Step 3: Cross multiply
    68,784.22x = 103,191.18 × 21,398.40
  4. Step 4: Simplify right side
    68,784.22x = 2,208,126,146.11
  5. Step 5: Solve for x
    x = 2,208,126,146.11/68,784.22
  6. Step 6: Final answer
    x = 32,102.22

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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.