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Finding the Fourth Proportional to 8,569.89, 11,838.42 and 8,121.02

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Solution

The fourth proportional to 8,569.89, 11,838.42 and 8,121.02 is: 11,218.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,569.89 : 11,838.42 = 8,121.02 : x
  2. Step 2: Convert to fraction form
    8,569.89/11,838.42 = 8,121.02/x
  3. Step 3: Cross multiply
    8,569.89x = 11,838.42 × 8,121.02
  4. Step 4: Simplify right side
    8,569.89x = 96,139,986.40
  5. Step 5: Solve for x
    x = 96,139,986.40/8,569.89
  6. Step 6: Final answer
    x = 11,218.35

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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.