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Finding the Fourth Proportional to 39,641.63, 54,700.43 and 21,731.93

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Solution

The fourth proportional to 39,641.63, 54,700.43 and 21,731.93 is: 29,987.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,641.63 : 54,700.43 = 21,731.93 : x
  2. Step 2: Convert to fraction form
    39,641.63/54,700.43 = 21,731.93/x
  3. Step 3: Cross multiply
    39,641.63x = 54,700.43 × 21,731.93
  4. Step 4: Simplify right side
    39,641.63x = 1,188,745,533.57
  5. Step 5: Solve for x
    x = 1,188,745,533.57/39,641.63
  6. Step 6: Final answer
    x = 29,987.31

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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.