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Finding the Fourth Proportional to 39,653.59, 54,722.70 and 21,749.50

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Solution

The fourth proportional to 39,653.59, 54,722.70 and 21,749.50 is: 30,014.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,653.59 : 54,722.70 = 21,749.50 : x
  2. Step 2: Convert to fraction form
    39,653.59/54,722.70 = 21,749.50/x
  3. Step 3: Cross multiply
    39,653.59x = 54,722.70 × 21,749.50
  4. Step 4: Simplify right side
    39,653.59x = 1,190,191,363.65
  5. Step 5: Solve for x
    x = 1,190,191,363.65/39,653.59
  6. Step 6: Final answer
    x = 30,014.72

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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.