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Finding the Fourth Proportional to 68,909.80, 103,368.23 and 18,988.79

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Solution

The fourth proportional to 68,909.80, 103,368.23 and 18,988.79 is: 28,484.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,909.80 : 103,368.23 = 18,988.79 : x
  2. Step 2: Convert to fraction form
    68,909.80/103,368.23 = 18,988.79/x
  3. Step 3: Cross multiply
    68,909.80x = 103,368.23 × 18,988.79
  4. Step 4: Simplify right side
    68,909.80x = 1,962,837,308.88
  5. Step 5: Solve for x
    x = 1,962,837,308.88/68,909.80
  6. Step 6: Final answer
    x = 28,484.15

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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.