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Finding the Fourth Proportional to 39,161, 54,041.76 and 21,256.64

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Solution

The fourth proportional to 39,161, 54,041.76 and 21,256.64 is: 29,333.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,161 : 54,041.76 = 21,256.64 : x
  2. Step 2: Convert to fraction form
    39,161/54,041.76 = 21,256.64/x
  3. Step 3: Cross multiply
    39,161x = 54,041.76 × 21,256.64
  4. Step 4: Simplify right side
    39,161x = 1,148,746,237.29
  5. Step 5: Solve for x
    x = 1,148,746,237.29/39,161
  6. Step 6: Final answer
    x = 29,333.94

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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.