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Finding the Fourth Proportional to 7,121.99, 10,678.98 and 2,959.20

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Solution

The fourth proportional to 7,121.99, 10,678.98 and 2,959.20 is: 4,437.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.99 : 10,678.98 = 2,959.20 : x
  2. Step 2: Convert to fraction form
    7,121.99/10,678.98 = 2,959.20/x
  3. Step 3: Cross multiply
    7,121.99x = 10,678.98 × 2,959.20
  4. Step 4: Simplify right side
    7,121.99x = 31,601,237.62
  5. Step 5: Solve for x
    x = 31,601,237.62/7,121.99
  6. Step 6: Final answer
    x = 4,437.14

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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.