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Finding the Fourth Proportional to 235,790.36, 325,389.78 and 128,360

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Solution

The fourth proportional to 235,790.36, 325,389.78 and 128,360 is: 177,136.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    235,790.36 : 325,389.78 = 128,360 : x
  2. Step 2: Convert to fraction form
    235,790.36/325,389.78 = 128,360/x
  3. Step 3: Cross multiply
    235,790.36x = 325,389.78 × 128,360
  4. Step 4: Simplify right side
    235,790.36x = 41,767,032,160.80
  5. Step 5: Solve for x
    x = 41,767,032,160.80/235,790.36
  6. Step 6: Final answer
    x = 177,136.30

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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.