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Finding the Fourth Proportional to 11,143.90, 15,393.54 and 8,921.68

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Solution

The fourth proportional to 11,143.90, 15,393.54 and 8,921.68 is: 12,323.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,143.90 : 15,393.54 = 8,921.68 : x
  2. Step 2: Convert to fraction form
    11,143.90/15,393.54 = 8,921.68/x
  3. Step 3: Cross multiply
    11,143.90x = 15,393.54 × 8,921.68
  4. Step 4: Simplify right side
    11,143.90x = 137,336,237.95
  5. Step 5: Solve for x
    x = 137,336,237.95/11,143.90
  6. Step 6: Final answer
    x = 12,323.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.