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Finding the Fourth Proportional to 20,953.58, 28,914.65 and 11,999.03

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Solution

The fourth proportional to 20,953.58, 28,914.65 and 11,999.03 is: 16,557.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,953.58 : 28,914.65 = 11,999.03 : x
  2. Step 2: Convert to fraction form
    20,953.58/28,914.65 = 11,999.03/x
  3. Step 3: Cross multiply
    20,953.58x = 28,914.65 × 11,999.03
  4. Step 4: Simplify right side
    20,953.58x = 346,947,752.79
  5. Step 5: Solve for x
    x = 346,947,752.79/20,953.58
  6. Step 6: Final answer
    x = 16,557.92

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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.