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Finding the Fourth Proportional to 7,920.99, 10,911.90 and 6,662.07

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Solution

The fourth proportional to 7,920.99, 10,911.90 and 6,662.07 is: 9,177.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.99 : 10,911.90 = 6,662.07 : x
  2. Step 2: Convert to fraction form
    7,920.99/10,911.90 = 6,662.07/x
  3. Step 3: Cross multiply
    7,920.99x = 10,911.90 × 6,662.07
  4. Step 4: Simplify right side
    7,920.99x = 72,695,841.63
  5. Step 5: Solve for x
    x = 72,695,841.63/7,920.99
  6. Step 6: Final answer
    x = 9,177.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.