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Finding the Fourth Proportional to 19,990.44, 29,985.66 and 6,139.44

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Solution

The fourth proportional to 19,990.44, 29,985.66 and 6,139.44 is: 9,209.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,990.44 : 29,985.66 = 6,139.44 : x
  2. Step 2: Convert to fraction form
    19,990.44/29,985.66 = 6,139.44/x
  3. Step 3: Cross multiply
    19,990.44x = 29,985.66 × 6,139.44
  4. Step 4: Simplify right side
    19,990.44x = 184,095,160.43
  5. Step 5: Solve for x
    x = 184,095,160.43/19,990.44
  6. Step 6: Final answer
    x = 9,209.16

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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.