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Finding the Fourth Proportional to 18,478.80, 27,711.72 and 7,389.36

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Solution

The fourth proportional to 18,478.80, 27,711.72 and 7,389.36 is: 11,081.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,478.80 : 27,711.72 = 7,389.36 : x
  2. Step 2: Convert to fraction form
    18,478.80/27,711.72 = 7,389.36/x
  3. Step 3: Cross multiply
    18,478.80x = 27,711.72 × 7,389.36
  4. Step 4: Simplify right side
    18,478.80x = 204,771,875.30
  5. Step 5: Solve for x
    x = 204,771,875.30/18,478.80
  6. Step 6: Final answer
    x = 11,081.45

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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.