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Finding the Fourth Proportional to 4,978.76, 6,869.90 and 2,853.89

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Solution

The fourth proportional to 4,978.76, 6,869.90 and 2,853.89 is: 3,937.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,978.76 : 6,869.90 = 2,853.89 : x
  2. Step 2: Convert to fraction form
    4,978.76/6,869.90 = 2,853.89/x
  3. Step 3: Cross multiply
    4,978.76x = 6,869.90 × 2,853.89
  4. Step 4: Simplify right side
    4,978.76x = 19,605,900.99
  5. Step 5: Solve for x
    x = 19,605,900.99/4,978.76
  6. Step 6: Final answer
    x = 3,937.91

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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.