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Finding the Fourth Proportional to 19,986.90, 29,991.15 and 8,301.30

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Solution

The fourth proportional to 19,986.90, 29,991.15 and 8,301.30 is: 12,456.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,986.90 : 29,991.15 = 8,301.30 : x
  2. Step 2: Convert to fraction form
    19,986.90/29,991.15 = 8,301.30/x
  3. Step 3: Cross multiply
    19,986.90x = 29,991.15 × 8,301.30
  4. Step 4: Simplify right side
    19,986.90x = 248,965,533.50
  5. Step 5: Solve for x
    x = 248,965,533.50/19,986.90
  6. Step 6: Final answer
    x = 12,456.44

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1.5x scale

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.