Home / 15,861.78-21,879.36-10,203.90

Finding the Fourth Proportional to 15,861.78, 21,879.36 and 10,203.90

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Solution

The fourth proportional to 15,861.78, 21,879.36 and 10,203.90 is: 14,075.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,861.78 : 21,879.36 = 10,203.90 : x
  2. Step 2: Convert to fraction form
    15,861.78/21,879.36 = 10,203.90/x
  3. Step 3: Cross multiply
    15,861.78x = 21,879.36 × 10,203.90
  4. Step 4: Simplify right side
    15,861.78x = 223,254,801.50
  5. Step 5: Solve for x
    x = 223,254,801.50/15,861.78
  6. Step 6: Final answer
    x = 14,075.02

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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.