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Finding the Fourth Proportional to 21,007.62, 28,990.80 and 12,054.78

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Solution

The fourth proportional to 21,007.62, 28,990.80 and 12,054.78 is: 16,635.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.62 : 28,990.80 = 12,054.78 : x
  2. Step 2: Convert to fraction form
    21,007.62/28,990.80 = 12,054.78/x
  3. Step 3: Cross multiply
    21,007.62x = 28,990.80 × 12,054.78
  4. Step 4: Simplify right side
    21,007.62x = 349,477,716.02
  5. Step 5: Solve for x
    x = 349,477,716.02/21,007.62
  6. Step 6: Final answer
    x = 16,635.76

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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.