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Finding the Fourth Proportional to 18,771.90, 28,148.76 and 7,674.18

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Solution

The fourth proportional to 18,771.90, 28,148.76 and 7,674.18 is: 11,507.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,771.90 : 28,148.76 = 7,674.18 : x
  2. Step 2: Convert to fraction form
    18,771.90/28,148.76 = 7,674.18/x
  3. Step 3: Cross multiply
    18,771.90x = 28,148.76 × 7,674.18
  4. Step 4: Simplify right side
    18,771.90x = 216,018,651.02
  5. Step 5: Solve for x
    x = 216,018,651.02/18,771.90
  6. Step 6: Final answer
    x = 11,507.55

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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.