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Finding the Fourth Proportional to 38,505.60, 53,137.80 and 21,738.60

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Solution

The fourth proportional to 38,505.60, 53,137.80 and 21,738.60 is: 29,999.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,505.60 : 53,137.80 = 21,738.60 : x
  2. Step 2: Convert to fraction form
    38,505.60/53,137.80 = 21,738.60/x
  3. Step 3: Cross multiply
    38,505.60x = 53,137.80 × 21,738.60
  4. Step 4: Simplify right side
    38,505.60x = 1,155,141,379.08
  5. Step 5: Solve for x
    x = 1,155,141,379.08/38,505.60
  6. Step 6: Final answer
    x = 29,999.31

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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.