Home / 12,640.08-18,960.10-5,239.60

Finding the Fourth Proportional to 12,640.08, 18,960.10 and 5,239.60

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Solution

The fourth proportional to 12,640.08, 18,960.10 and 5,239.60 is: 7,859.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.08 : 18,960.10 = 5,239.60 : x
  2. Step 2: Convert to fraction form
    12,640.08/18,960.10 = 5,239.60/x
  3. Step 3: Cross multiply
    12,640.08x = 18,960.10 × 5,239.60
  4. Step 4: Simplify right side
    12,640.08x = 99,343,339.96
  5. Step 5: Solve for x
    x = 99,343,339.96/12,640.08
  6. Step 6: Final answer
    x = 7,859.39

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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.