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Finding the Fourth Proportional to 618,810.78, 928,480.80 and 259,065.66

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Solution

The fourth proportional to 618,810.78, 928,480.80 and 259,065.66 is: 388,709.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    618,810.78 : 928,480.80 = 259,065.66 : x
  2. Step 2: Convert to fraction form
    618,810.78/928,480.80 = 259,065.66/x
  3. Step 3: Cross multiply
    618,810.78x = 928,480.80 × 259,065.66
  4. Step 4: Simplify right side
    618,810.78x = 240,537,491,249.33
  5. Step 5: Solve for x
    x = 240,537,491,249.33/618,810.78
  6. Step 6: Final answer
    x = 388,709.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.