Home / 13,389.45-18,478.74-7,421.13

Finding the Fourth Proportional to 13,389.45, 18,478.74 and 7,421.13

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Solution

The fourth proportional to 13,389.45, 18,478.74 and 7,421.13 is: 10,241.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.45 : 18,478.74 = 7,421.13 : x
  2. Step 2: Convert to fraction form
    13,389.45/18,478.74 = 7,421.13/x
  3. Step 3: Cross multiply
    13,389.45x = 18,478.74 × 7,421.13
  4. Step 4: Simplify right side
    13,389.45x = 137,133,131.78
  5. Step 5: Solve for x
    x = 137,133,131.78/13,389.45
  6. Step 6: Final answer
    x = 10,241.88

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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.