Home / 12,420.42-18,632.16-3,987.48

Finding the Fourth Proportional to 12,420.42, 18,632.16 and 3,987.48

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Solution

The fourth proportional to 12,420.42, 18,632.16 and 3,987.48 is: 5,981.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.42 : 18,632.16 = 3,987.48 : x
  2. Step 2: Convert to fraction form
    12,420.42/18,632.16 = 3,987.48/x
  3. Step 3: Cross multiply
    12,420.42x = 18,632.16 × 3,987.48
  4. Step 4: Simplify right side
    12,420.42x = 74,295,365.36
  5. Step 5: Solve for x
    x = 74,295,365.36/12,420.42
  6. Step 6: Final answer
    x = 5,981.71

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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.