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Finding the Fourth Proportional to 39,006.72, 53,829.20 and 21,101.74

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Solution

The fourth proportional to 39,006.72, 53,829.20 and 21,101.74 is: 29,120.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,006.72 : 53,829.20 = 21,101.74 : x
  2. Step 2: Convert to fraction form
    39,006.72/53,829.20 = 21,101.74/x
  3. Step 3: Cross multiply
    39,006.72x = 53,829.20 × 21,101.74
  4. Step 4: Simplify right side
    39,006.72x = 1,135,889,782.81
  5. Step 5: Solve for x
    x = 1,135,889,782.81/39,006.72
  6. Step 6: Final answer
    x = 29,120.36

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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.