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Finding the Fourth Proportional to 7,189.76, 9,918.56 and 5,197.16

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Solution

The fourth proportional to 7,189.76, 9,918.56 and 5,197.16 is: 7,169.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,189.76 : 9,918.56 = 5,197.16 : x
  2. Step 2: Convert to fraction form
    7,189.76/9,918.56 = 5,197.16/x
  3. Step 3: Cross multiply
    7,189.76x = 9,918.56 × 5,197.16
  4. Step 4: Simplify right side
    7,189.76x = 51,548,343.29
  5. Step 5: Solve for x
    x = 51,548,343.29/7,189.76
  6. Step 6: Final answer
    x = 7,169.69

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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.