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Finding the Fourth Proportional to 1,303.20, 1,798.48 and 779.20

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Solution

The fourth proportional to 1,303.20, 1,798.48 and 779.20 is: 1,075.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,303.20 : 1,798.48 = 779.20 : x
  2. Step 2: Convert to fraction form
    1,303.20/1,798.48 = 779.20/x
  3. Step 3: Cross multiply
    1,303.20x = 1,798.48 × 779.20
  4. Step 4: Simplify right side
    1,303.20x = 1,401,375.62
  5. Step 5: Solve for x
    x = 1,401,375.62/1,303.20
  6. Step 6: Final answer
    x = 1,075.33

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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.