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Finding the Fourth Proportional to 20,642.58, 28,486.80 and 11,211.12

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Solution

The fourth proportional to 20,642.58, 28,486.80 and 11,211.12 is: 15,471.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,642.58 : 28,486.80 = 11,211.12 : x
  2. Step 2: Convert to fraction form
    20,642.58/28,486.80 = 11,211.12/x
  3. Step 3: Cross multiply
    20,642.58x = 28,486.80 × 11,211.12
  4. Step 4: Simplify right side
    20,642.58x = 319,368,933.22
  5. Step 5: Solve for x
    x = 319,368,933.22/20,642.58
  6. Step 6: Final answer
    x = 15,471.37

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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.