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Finding the Fourth Proportional to 19,615.93, 29,420.79 and 8,519.64

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Solution

The fourth proportional to 19,615.93, 29,420.79 and 8,519.64 is: 12,778.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,615.93 : 29,420.79 = 8,519.64 : x
  2. Step 2: Convert to fraction form
    19,615.93/29,420.79 = 8,519.64/x
  3. Step 3: Cross multiply
    19,615.93x = 29,420.79 × 8,519.64
  4. Step 4: Simplify right side
    19,615.93x = 250,654,539.32
  5. Step 5: Solve for x
    x = 250,654,539.32/19,615.93
  6. Step 6: Final answer
    x = 12,778.11

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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.