Home / 21,894.32-30,336.20-21,421.38

Finding the Fourth Proportional to 21,894.32, 30,336.20 and 21,421.38

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Solution

The fourth proportional to 21,894.32, 30,336.20 and 21,421.38 is: 29,680.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,894.32 : 30,336.20 = 21,421.38 : x
  2. Step 2: Convert to fraction form
    21,894.32/30,336.20 = 21,421.38/x
  3. Step 3: Cross multiply
    21,894.32x = 30,336.20 × 21,421.38
  4. Step 4: Simplify right side
    21,894.32x = 649,843,321.51
  5. Step 5: Solve for x
    x = 649,843,321.51/21,894.32
  6. Step 6: Final answer
    x = 29,680.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.