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Finding the Fourth Proportional to 4,990.78, 7,491.62 and 2,071.12

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Solution

The fourth proportional to 4,990.78, 7,491.62 and 2,071.12 is: 3,108.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,990.78 : 7,491.62 = 2,071.12 : x
  2. Step 2: Convert to fraction form
    4,990.78/7,491.62 = 2,071.12/x
  3. Step 3: Cross multiply
    4,990.78x = 7,491.62 × 2,071.12
  4. Step 4: Simplify right side
    4,990.78x = 15,516,044.01
  5. Step 5: Solve for x
    x = 15,516,044.01/4,990.78
  6. Step 6: Final answer
    x = 3,108.94

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1.5x scale

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.