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Finding the Fourth Proportional to 39,315.78, 54,255.78 and 21,410.78

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Solution

The fourth proportional to 39,315.78, 54,255.78 and 21,410.78 is: 29,546.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,315.78 : 54,255.78 = 21,410.78 : x
  2. Step 2: Convert to fraction form
    39,315.78/54,255.78 = 21,410.78/x
  3. Step 3: Cross multiply
    39,315.78x = 54,255.78 × 21,410.78
  4. Step 4: Simplify right side
    39,315.78x = 1,161,658,569.31
  5. Step 5: Solve for x
    x = 1,161,658,569.31/39,315.78
  6. Step 6: Final answer
    x = 29,546.88

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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.