Home / 14,105.78-21,137.88-7,857.20

Finding the Fourth Proportional to 14,105.78, 21,137.88 and 7,857.20

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Solution

The fourth proportional to 14,105.78, 21,137.88 and 7,857.20 is: 11,774.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,105.78 : 21,137.88 = 7,857.20 : x
  2. Step 2: Convert to fraction form
    14,105.78/21,137.88 = 7,857.20/x
  3. Step 3: Cross multiply
    14,105.78x = 21,137.88 × 7,857.20
  4. Step 4: Simplify right side
    14,105.78x = 166,084,550.74
  5. Step 5: Solve for x
    x = 166,084,550.74/14,105.78
  6. Step 6: Final answer
    x = 11,774.22

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1.5x scale

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.