Home / 12,420.78-18,624.96-3,986.16

Finding the Fourth Proportional to 12,420.78, 18,624.96 and 3,986.16

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Solution

The fourth proportional to 12,420.78, 18,624.96 and 3,986.16 is: 5,977.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.78 : 18,624.96 = 3,986.16 : x
  2. Step 2: Convert to fraction form
    12,420.78/18,624.96 = 3,986.16/x
  3. Step 3: Cross multiply
    12,420.78x = 18,624.96 × 3,986.16
  4. Step 4: Simplify right side
    12,420.78x = 74,242,070.55
  5. Step 5: Solve for x
    x = 74,242,070.55/12,420.78
  6. Step 6: Final answer
    x = 5,977.25

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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.