Home / 13,389.99-18,478.22-7,421.75

Finding the Fourth Proportional to 13,389.99, 18,478.22 and 7,421.75

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Solution

The fourth proportional to 13,389.99, 18,478.22 and 7,421.75 is: 10,242.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.99 : 18,478.22 = 7,421.75 : x
  2. Step 2: Convert to fraction form
    13,389.99/18,478.22 = 7,421.75/x
  3. Step 3: Cross multiply
    13,389.99x = 18,478.22 × 7,421.75
  4. Step 4: Simplify right side
    13,389.99x = 137,140,729.29
  5. Step 5: Solve for x
    x = 137,140,729.29/13,389.99
  6. Step 6: Final answer
    x = 10,242.03

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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.