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Finding the Fourth Proportional to 20,909.99, 28,852.06 and 11,835.31

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Solution

The fourth proportional to 20,909.99, 28,852.06 and 11,835.31 is: 16,330.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.99 : 28,852.06 = 11,835.31 : x
  2. Step 2: Convert to fraction form
    20,909.99/28,852.06 = 11,835.31/x
  3. Step 3: Cross multiply
    20,909.99x = 28,852.06 × 11,835.31
  4. Step 4: Simplify right side
    20,909.99x = 341,473,000.95
  5. Step 5: Solve for x
    x = 341,473,000.95/20,909.99
  6. Step 6: Final answer
    x = 16,330.62

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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.