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Finding the Fourth Proportional to 20,651.99, 28,499.72 and 11,220.48

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Solution

The fourth proportional to 20,651.99, 28,499.72 and 11,220.48 is: 15,484.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,651.99 : 28,499.72 = 11,220.48 : x
  2. Step 2: Convert to fraction form
    20,651.99/28,499.72 = 11,220.48/x
  3. Step 3: Cross multiply
    20,651.99x = 28,499.72 × 11,220.48
  4. Step 4: Simplify right side
    20,651.99x = 319,780,482.16
  5. Step 5: Solve for x
    x = 319,780,482.16/20,651.99
  6. Step 6: Final answer
    x = 15,484.25

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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.