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Finding the Fourth Proportional to 13,389.60, 18,478.74 and 7,423.14

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Solution

The fourth proportional to 13,389.60, 18,478.74 and 7,423.14 is: 10,244.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.60 : 18,478.74 = 7,423.14 : x
  2. Step 2: Convert to fraction form
    13,389.60/18,478.74 = 7,423.14/x
  3. Step 3: Cross multiply
    13,389.60x = 18,478.74 × 7,423.14
  4. Step 4: Simplify right side
    13,389.60x = 137,170,274.04
  5. Step 5: Solve for x
    x = 137,170,274.04/13,389.60
  6. Step 6: Final answer
    x = 10,244.54

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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.