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Finding the Fourth Proportional to 38,707.50, 53,415.99 and 21,940.50

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Solution

The fourth proportional to 38,707.50, 53,415.99 and 21,940.50 is: 30,277.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,707.50 : 53,415.99 = 21,940.50 : x
  2. Step 2: Convert to fraction form
    38,707.50/53,415.99 = 21,940.50/x
  3. Step 3: Cross multiply
    38,707.50x = 53,415.99 × 21,940.50
  4. Step 4: Simplify right side
    38,707.50x = 1,171,973,528.60
  5. Step 5: Solve for x
    x = 1,171,973,528.60/38,707.50
  6. Step 6: Final answer
    x = 30,277.69

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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.