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Finding the Fourth Proportional to 15,009.25, 20,712.77 and 8,385.25

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Solution

The fourth proportional to 15,009.25, 20,712.77 and 8,385.25 is: 11,571.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,009.25 : 20,712.77 = 8,385.25 : x
  2. Step 2: Convert to fraction form
    15,009.25/20,712.77 = 8,385.25/x
  3. Step 3: Cross multiply
    15,009.25x = 20,712.77 × 8,385.25
  4. Step 4: Simplify right side
    15,009.25x = 173,681,754.64
  5. Step 5: Solve for x
    x = 173,681,754.64/15,009.25
  6. Step 6: Final answer
    x = 11,571.65

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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.