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Finding the Fourth Proportional to 7,172.19, 9,900.65 and 6,723.81

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Solution

The fourth proportional to 7,172.19, 9,900.65 and 6,723.81 is: 9,281.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,172.19 : 9,900.65 = 6,723.81 : x
  2. Step 2: Convert to fraction form
    7,172.19/9,900.65 = 6,723.81/x
  3. Step 3: Cross multiply
    7,172.19x = 9,900.65 × 6,723.81
  4. Step 4: Simplify right side
    7,172.19x = 66,570,055.86
  5. Step 5: Solve for x
    x = 66,570,055.86/7,172.19
  6. Step 6: Final answer
    x = 9,281.69

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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.