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Finding the Fourth Proportional to 7,189.68, 9,921.78 and 4,045.80

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Solution

The fourth proportional to 7,189.68, 9,921.78 and 4,045.80 is: 5,583.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,189.68 : 9,921.78 = 4,045.80 : x
  2. Step 2: Convert to fraction form
    7,189.68/9,921.78 = 4,045.80/x
  3. Step 3: Cross multiply
    7,189.68x = 9,921.78 × 4,045.80
  4. Step 4: Simplify right side
    7,189.68x = 40,141,537.52
  5. Step 5: Solve for x
    x = 40,141,537.52/7,189.68
  6. Step 6: Final answer
    x = 5,583.22

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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.