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Finding the Fourth Proportional to 1,442.48, 1,990.62 and 779.33

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Solution

The fourth proportional to 1,442.48, 1,990.62 and 779.33 is: 1,075.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.48 : 1,990.62 = 779.33 : x
  2. Step 2: Convert to fraction form
    1,442.48/1,990.62 = 779.33/x
  3. Step 3: Cross multiply
    1,442.48x = 1,990.62 × 779.33
  4. Step 4: Simplify right side
    1,442.48x = 1,551,347.40
  5. Step 5: Solve for x
    x = 1,551,347.40/1,442.48
  6. Step 6: Final answer
    x = 1,075.47

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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.