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Finding the Fourth Proportional to 20,957.25, 28,919.25 and 12,342.06

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Solution

The fourth proportional to 20,957.25, 28,919.25 and 12,342.06 is: 17,031.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.25 : 28,919.25 = 12,342.06 : x
  2. Step 2: Convert to fraction form
    20,957.25/28,919.25 = 12,342.06/x
  3. Step 3: Cross multiply
    20,957.25x = 28,919.25 × 12,342.06
  4. Step 4: Simplify right side
    20,957.25x = 356,923,118.66
  5. Step 5: Solve for x
    x = 356,923,118.66/20,957.25
  6. Step 6: Final answer
    x = 17,031.01

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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.