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Finding the Fourth Proportional to 20,970.65, 28,932.09 and 11,894.70

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Solution

The fourth proportional to 20,970.65, 28,932.09 and 11,894.70 is: 16,410.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.65 : 28,932.09 = 11,894.70 : x
  2. Step 2: Convert to fraction form
    20,970.65/28,932.09 = 11,894.70/x
  3. Step 3: Cross multiply
    20,970.65x = 28,932.09 × 11,894.70
  4. Step 4: Simplify right side
    20,970.65x = 344,138,432.07
  5. Step 5: Solve for x
    x = 344,138,432.07/20,970.65
  6. Step 6: Final answer
    x = 16,410.48

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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.