Home / 13,142.78-18,130.47-8,423.54

Finding the Fourth Proportional to 13,142.78, 18,130.47 and 8,423.54

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Solution

The fourth proportional to 13,142.78, 18,130.47 and 8,423.54 is: 11,620.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,142.78 : 18,130.47 = 8,423.54 : x
  2. Step 2: Convert to fraction form
    13,142.78/18,130.47 = 8,423.54/x
  3. Step 3: Cross multiply
    13,142.78x = 18,130.47 × 8,423.54
  4. Step 4: Simplify right side
    13,142.78x = 152,722,739.26
  5. Step 5: Solve for x
    x = 152,722,739.26/13,142.78
  6. Step 6: Final answer
    x = 11,620.28

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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.