Home / 13,147.50-18,143.58-8,438.16

Finding the Fourth Proportional to 13,147.50, 18,143.58 and 8,438.16

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Solution

The fourth proportional to 13,147.50, 18,143.58 and 8,438.16 is: 11,644.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,147.50 : 18,143.58 = 8,438.16 : x
  2. Step 2: Convert to fraction form
    13,147.50/18,143.58 = 8,438.16/x
  3. Step 3: Cross multiply
    13,147.50x = 18,143.58 × 8,438.16
  4. Step 4: Simplify right side
    13,147.50x = 153,098,431.01
  5. Step 5: Solve for x
    x = 153,098,431.01/13,147.50
  6. Step 6: Final answer
    x = 11,644.68

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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.