Home / 15,131.09-20,869.08-12,900.35

Finding the Fourth Proportional to 15,131.09, 20,869.08 and 12,900.35

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Solution

The fourth proportional to 15,131.09, 20,869.08 and 12,900.35 is: 17,792.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,131.09 : 20,869.08 = 12,900.35 : x
  2. Step 2: Convert to fraction form
    15,131.09/20,869.08 = 12,900.35/x
  3. Step 3: Cross multiply
    15,131.09x = 20,869.08 × 12,900.35
  4. Step 4: Simplify right side
    15,131.09x = 269,218,331.83
  5. Step 5: Solve for x
    x = 269,218,331.83/15,131.09
  6. Step 6: Final answer
    x = 17,792.40

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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.