Home / 13,389.65-20,064.68-12,640.77

Finding the Fourth Proportional to 13,389.65, 20,064.68 and 12,640.77

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Solution

The fourth proportional to 13,389.65, 20,064.68 and 12,640.77 is: 18,942.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.65 : 20,064.68 = 12,640.77 : x
  2. Step 2: Convert to fraction form
    13,389.65/20,064.68 = 12,640.77/x
  3. Step 3: Cross multiply
    13,389.65x = 20,064.68 × 12,640.77
  4. Step 4: Simplify right side
    13,389.65x = 253,632,941.80
  5. Step 5: Solve for x
    x = 253,632,941.80/13,389.65
  6. Step 6: Final answer
    x = 18,942.47

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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.