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Finding the Fourth Proportional to 421,756.26, 634,151.79 and 388,878.54

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Solution

The fourth proportional to 421,756.26, 634,151.79 and 388,878.54 is: 584,716.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,756.26 : 634,151.79 = 388,878.54 : x
  2. Step 2: Convert to fraction form
    421,756.26/634,151.79 = 388,878.54/x
  3. Step 3: Cross multiply
    421,756.26x = 634,151.79 × 388,878.54
  4. Step 4: Simplify right side
    421,756.26x = 246,608,022,233.59
  5. Step 5: Solve for x
    x = 246,608,022,233.59/421,756.26
  6. Step 6: Final answer
    x = 584,716.92

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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.