Home / 13,290.72-19,936.11-12,478.80

Finding the Fourth Proportional to 13,290.72, 19,936.11 and 12,478.80

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Solution

The fourth proportional to 13,290.72, 19,936.11 and 12,478.80 is: 18,718.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,290.72 : 19,936.11 = 12,478.80 : x
  2. Step 2: Convert to fraction form
    13,290.72/19,936.11 = 12,478.80/x
  3. Step 3: Cross multiply
    13,290.72x = 19,936.11 × 12,478.80
  4. Step 4: Simplify right side
    13,290.72x = 248,778,667.07
  5. Step 5: Solve for x
    x = 248,778,667.07/13,290.72
  6. Step 6: Final answer
    x = 18,718.22

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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.