Home / 13,981.10-20,971.62-4,120.47

Finding the Fourth Proportional to 13,981.10, 20,971.62 and 4,120.47

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Solution

The fourth proportional to 13,981.10, 20,971.62 and 4,120.47 is: 6,180.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,981.10 : 20,971.62 = 4,120.47 : x
  2. Step 2: Convert to fraction form
    13,981.10/20,971.62 = 4,120.47/x
  3. Step 3: Cross multiply
    13,981.10x = 20,971.62 × 4,120.47
  4. Step 4: Simplify right side
    13,981.10x = 86,412,931.06
  5. Step 5: Solve for x
    x = 86,412,931.06/13,981.10
  6. Step 6: Final answer
    x = 6,180.70

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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.