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Finding the Fourth Proportional to 18,459.80, 27,688.71 and 5,311.65

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Solution

The fourth proportional to 18,459.80, 27,688.71 and 5,311.65 is: 7,967.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,459.80 : 27,688.71 = 5,311.65 : x
  2. Step 2: Convert to fraction form
    18,459.80/27,688.71 = 5,311.65/x
  3. Step 3: Cross multiply
    18,459.80x = 27,688.71 × 5,311.65
  4. Step 4: Simplify right side
    18,459.80x = 147,072,736.47
  5. Step 5: Solve for x
    x = 147,072,736.47/18,459.80
  6. Step 6: Final answer
    x = 7,967.19

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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.