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Finding the Fourth Proportional to 11,138.90, 16,708.35 and 9,929.30

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Solution

The fourth proportional to 11,138.90, 16,708.35 and 9,929.30 is: 14,893.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,138.90 : 16,708.35 = 9,929.30 : x
  2. Step 2: Convert to fraction form
    11,138.90/16,708.35 = 9,929.30/x
  3. Step 3: Cross multiply
    11,138.90x = 16,708.35 × 9,929.30
  4. Step 4: Simplify right side
    11,138.90x = 165,902,219.66
  5. Step 5: Solve for x
    x = 165,902,219.66/11,138.90
  6. Step 6: Final answer
    x = 14,893.95

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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.