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Finding the Fourth Proportional to 20,644.80, 28,488.40 and 11,213.16

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Solution

The fourth proportional to 20,644.80, 28,488.40 and 11,213.16 is: 15,473.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,644.80 : 28,488.40 = 11,213.16 : x
  2. Step 2: Convert to fraction form
    20,644.80/28,488.40 = 11,213.16/x
  3. Step 3: Cross multiply
    20,644.80x = 28,488.40 × 11,213.16
  4. Step 4: Simplify right side
    20,644.80x = 319,444,987.34
  5. Step 5: Solve for x
    x = 319,444,987.34/20,644.80
  6. Step 6: Final answer
    x = 15,473.39

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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.