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Finding the Fourth Proportional to 7,007.80, 9,789.05 and 7,007.80

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Solution

The fourth proportional to 7,007.80, 9,789.05 and 7,007.80 is: 9,789.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,007.80 : 9,789.05 = 7,007.80 : x
  2. Step 2: Convert to fraction form
    7,007.80/9,789.05 = 7,007.80/x
  3. Step 3: Cross multiply
    7,007.80x = 9,789.05 × 7,007.80
  4. Step 4: Simplify right side
    7,007.80x = 68,599,704.59
  5. Step 5: Solve for x
    x = 68,599,704.59/7,007.80
  6. Step 6: Final answer
    x = 9,789.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.