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Finding the Fourth Proportional to 5,118.99, 7,678.48 and 1,421.22

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Solution

The fourth proportional to 5,118.99, 7,678.48 and 1,421.22 is: 2,131.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,118.99 : 7,678.48 = 1,421.22 : x
  2. Step 2: Convert to fraction form
    5,118.99/7,678.48 = 1,421.22/x
  3. Step 3: Cross multiply
    5,118.99x = 7,678.48 × 1,421.22
  4. Step 4: Simplify right side
    5,118.99x = 10,912,770.95
  5. Step 5: Solve for x
    x = 10,912,770.95/5,118.99
  6. Step 6: Final answer
    x = 2,131.82

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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.