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Finding the Fourth Proportional to 4,990, 7,484.97 and 1,292.22

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Solution

The fourth proportional to 4,990, 7,484.97 and 1,292.22 is: 1,938.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,990 : 7,484.97 = 1,292.22 : x
  2. Step 2: Convert to fraction form
    4,990/7,484.97 = 1,292.22/x
  3. Step 3: Cross multiply
    4,990x = 7,484.97 × 1,292.22
  4. Step 4: Simplify right side
    4,990x = 9,672,227.93
  5. Step 5: Solve for x
    x = 9,672,227.93/4,990
  6. Step 6: Final answer
    x = 1,938.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.