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Finding the Fourth Proportional to 38,978.08, 53,789.75 and 21,073.08

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Solution

The fourth proportional to 38,978.08, 53,789.75 and 21,073.08 is: 29,080.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,978.08 : 53,789.75 = 21,073.08 : x
  2. Step 2: Convert to fraction form
    38,978.08/53,789.75 = 21,073.08/x
  3. Step 3: Cross multiply
    38,978.08x = 53,789.75 × 21,073.08
  4. Step 4: Simplify right side
    38,978.08x = 1,133,515,783.95
  5. Step 5: Solve for x
    x = 1,133,515,783.95/38,978.08
  6. Step 6: Final answer
    x = 29,080.85

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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.