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Finding the Fourth Proportional to 7,043.94, 9,721.50 and 4,019.79

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Solution

The fourth proportional to 7,043.94, 9,721.50 and 4,019.79 is: 5,547.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,043.94 : 9,721.50 = 4,019.79 : x
  2. Step 2: Convert to fraction form
    7,043.94/9,721.50 = 4,019.79/x
  3. Step 3: Cross multiply
    7,043.94x = 9,721.50 × 4,019.79
  4. Step 4: Simplify right side
    7,043.94x = 39,078,388.49
  5. Step 5: Solve for x
    x = 39,078,388.49/7,043.94
  6. Step 6: Final answer
    x = 5,547.80

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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.