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Finding the Fourth Proportional to 20,696.66, 28,544.64 and 12,724.64

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Solution

The fourth proportional to 20,696.66, 28,544.64 and 12,724.64 is: 17,549.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,696.66 : 28,544.64 = 12,724.64 : x
  2. Step 2: Convert to fraction form
    20,696.66/28,544.64 = 12,724.64/x
  3. Step 3: Cross multiply
    20,696.66x = 28,544.64 × 12,724.64
  4. Step 4: Simplify right side
    20,696.66x = 363,220,267.93
  5. Step 5: Solve for x
    x = 363,220,267.93/20,696.66
  6. Step 6: Final answer
    x = 17,549.70

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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.