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Finding the Fourth Proportional to 7,918.80, 11,878.08 and 2,075.28

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Solution

The fourth proportional to 7,918.80, 11,878.08 and 2,075.28 is: 3,112.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,918.80 : 11,878.08 = 2,075.28 : x
  2. Step 2: Convert to fraction form
    7,918.80/11,878.08 = 2,075.28/x
  3. Step 3: Cross multiply
    7,918.80x = 11,878.08 × 2,075.28
  4. Step 4: Simplify right side
    7,918.80x = 24,650,341.86
  5. Step 5: Solve for x
    x = 24,650,341.86/7,918.80
  6. Step 6: Final answer
    x = 3,112.89

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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.