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Finding the Fourth Proportional to 8,918.91, 12,296.70 and 7,319.70

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Solution

The fourth proportional to 8,918.91, 12,296.70 and 7,319.70 is: 10,091.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,918.91 : 12,296.70 = 7,319.70 : x
  2. Step 2: Convert to fraction form
    8,918.91/12,296.70 = 7,319.70/x
  3. Step 3: Cross multiply
    8,918.91x = 12,296.70 × 7,319.70
  4. Step 4: Simplify right side
    8,918.91x = 90,008,154.99
  5. Step 5: Solve for x
    x = 90,008,154.99/8,918.91
  6. Step 6: Final answer
    x = 10,091.83

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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.