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Finding the Fourth Proportional to 2,940.48, 4,409.76 and 992.40

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Solution

The fourth proportional to 2,940.48, 4,409.76 and 992.40 is: 1,488.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,940.48 : 4,409.76 = 992.40 : x
  2. Step 2: Convert to fraction form
    2,940.48/4,409.76 = 992.40/x
  3. Step 3: Cross multiply
    2,940.48x = 4,409.76 × 992.40
  4. Step 4: Simplify right side
    2,940.48x = 4,376,245.82
  5. Step 5: Solve for x
    x = 4,376,245.82/2,940.48
  6. Step 6: Final answer
    x = 1,488.28

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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.