Home / 21,981.65-30,337.34-12,421.94

Finding the Fourth Proportional to 21,981.65, 30,337.34 and 12,421.94

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Solution

The fourth proportional to 21,981.65, 30,337.34 and 12,421.94 is: 17,143.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,981.65 : 30,337.34 = 12,421.94 : x
  2. Step 2: Convert to fraction form
    21,981.65/30,337.34 = 12,421.94/x
  3. Step 3: Cross multiply
    21,981.65x = 30,337.34 × 12,421.94
  4. Step 4: Simplify right side
    21,981.65x = 376,848,403.44
  5. Step 5: Solve for x
    x = 376,848,403.44/21,981.65
  6. Step 6: Final answer
    x = 17,143.78

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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.