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Finding the Fourth Proportional to 20,661.77, 30,987.18 and 8,972.25

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Solution

The fourth proportional to 20,661.77, 30,987.18 and 8,972.25 is: 13,456.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.77 : 30,987.18 = 8,972.25 : x
  2. Step 2: Convert to fraction form
    20,661.77/30,987.18 = 8,972.25/x
  3. Step 3: Cross multiply
    20,661.77x = 30,987.18 × 8,972.25
  4. Step 4: Simplify right side
    20,661.77x = 278,024,725.76
  5. Step 5: Solve for x
    x = 278,024,725.76/20,661.77
  6. Step 6: Final answer
    x = 13,456.00

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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.