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Finding the Fourth Proportional to 4,645.80, 6,978.42 and 3,916.80

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Solution

The fourth proportional to 4,645.80, 6,978.42 and 3,916.80 is: 5,883.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,645.80 : 6,978.42 = 3,916.80 : x
  2. Step 2: Convert to fraction form
    4,645.80/6,978.42 = 3,916.80/x
  3. Step 3: Cross multiply
    4,645.80x = 6,978.42 × 3,916.80
  4. Step 4: Simplify right side
    4,645.80x = 27,333,075.46
  5. Step 5: Solve for x
    x = 27,333,075.46/4,645.80
  6. Step 6: Final answer
    x = 5,883.39

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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.