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Finding the Fourth Proportional to 38,980.91, 53,793.86 and 21,075.86

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Solution

The fourth proportional to 38,980.91, 53,793.86 and 21,075.86 is: 29,084.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,980.91 : 53,793.86 = 21,075.86 : x
  2. Step 2: Convert to fraction form
    38,980.91/53,793.86 = 21,075.86/x
  3. Step 3: Cross multiply
    38,980.91x = 53,793.86 × 21,075.86
  4. Step 4: Simplify right side
    38,980.91x = 1,133,751,891.32
  5. Step 5: Solve for x
    x = 1,133,751,891.32/38,980.91
  6. Step 6: Final answer
    x = 29,084.80

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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.