Home / 28,413.95-39,196.85-21,687.90

Finding the Fourth Proportional to 28,413.95, 39,196.85 and 21,687.90

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Solution

The fourth proportional to 28,413.95, 39,196.85 and 21,687.90 is: 29,918.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,413.95 : 39,196.85 = 21,687.90 : x
  2. Step 2: Convert to fraction form
    28,413.95/39,196.85 = 21,687.90/x
  3. Step 3: Cross multiply
    28,413.95x = 39,196.85 × 21,687.90
  4. Step 4: Simplify right side
    28,413.95x = 850,097,254.68
  5. Step 5: Solve for x
    x = 850,097,254.68/28,413.95
  6. Step 6: Final answer
    x = 29,918.31

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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.