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Finding the Fourth Proportional to 18,421.65, 27,636.80 and 7,328.97

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Solution

The fourth proportional to 18,421.65, 27,636.80 and 7,328.97 is: 10,995.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,421.65 : 27,636.80 = 7,328.97 : x
  2. Step 2: Convert to fraction form
    18,421.65/27,636.80 = 7,328.97/x
  3. Step 3: Cross multiply
    18,421.65x = 27,636.80 × 7,328.97
  4. Step 4: Simplify right side
    18,421.65x = 202,549,278.10
  5. Step 5: Solve for x
    x = 202,549,278.10/18,421.65
  6. Step 6: Final answer
    x = 10,995.18

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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.