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Finding the Fourth Proportional to 8,637.62, 11,921.70 and 5,647.90

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Solution

The fourth proportional to 8,637.62, 11,921.70 and 5,647.90 is: 7,795.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,637.62 : 11,921.70 = 5,647.90 : x
  2. Step 2: Convert to fraction form
    8,637.62/11,921.70 = 5,647.90/x
  3. Step 3: Cross multiply
    8,637.62x = 11,921.70 × 5,647.90
  4. Step 4: Simplify right side
    8,637.62x = 67,332,569.43
  5. Step 5: Solve for x
    x = 67,332,569.43/8,637.62
  6. Step 6: Final answer
    x = 7,795.27

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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.