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Finding the Fourth Proportional to 19,619.70, 29,412.90 and 8,518.02

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Solution

The fourth proportional to 19,619.70, 29,412.90 and 8,518.02 is: 12,769.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,619.70 : 29,412.90 = 8,518.02 : x
  2. Step 2: Convert to fraction form
    19,619.70/29,412.90 = 8,518.02/x
  3. Step 3: Cross multiply
    19,619.70x = 29,412.90 × 8,518.02
  4. Step 4: Simplify right side
    19,619.70x = 250,539,670.46
  5. Step 5: Solve for x
    x = 250,539,670.46/19,619.70
  6. Step 6: Final answer
    x = 12,769.80

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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.