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Finding the Fourth Proportional to 660,696, 911,745.60 and 385,036.80

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Solution

The fourth proportional to 660,696, 911,745.60 and 385,036.80 is: 531,342.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,696 : 911,745.60 = 385,036.80 : x
  2. Step 2: Convert to fraction form
    660,696/911,745.60 = 385,036.80/x
  3. Step 3: Cross multiply
    660,696x = 911,745.60 × 385,036.80
  4. Step 4: Simplify right side
    660,696x = 351,055,608,238.08
  5. Step 5: Solve for x
    x = 351,055,608,238.08/660,696
  6. Step 6: Final answer
    x = 531,342.11

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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.