Home / 21,840.16-30,139.51-12,409.24

Finding the Fourth Proportional to 21,840.16, 30,139.51 and 12,409.24

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Solution

The fourth proportional to 21,840.16, 30,139.51 and 12,409.24 is: 17,124.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,840.16 : 30,139.51 = 12,409.24 : x
  2. Step 2: Convert to fraction form
    21,840.16/30,139.51 = 12,409.24/x
  3. Step 3: Cross multiply
    21,840.16x = 30,139.51 × 12,409.24
  4. Step 4: Simplify right side
    21,840.16x = 374,008,413.07
  5. Step 5: Solve for x
    x = 374,008,413.07/21,840.16
  6. Step 6: Final answer
    x = 17,124.80

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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.