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Finding the Fourth Proportional to 1,978.11, 2,967.15 and 745.19

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Solution

The fourth proportional to 1,978.11, 2,967.15 and 745.19 is: 1,117.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.11 : 2,967.15 = 745.19 : x
  2. Step 2: Convert to fraction form
    1,978.11/2,967.15 = 745.19/x
  3. Step 3: Cross multiply
    1,978.11x = 2,967.15 × 745.19
  4. Step 4: Simplify right side
    1,978.11x = 2,211,075.67
  5. Step 5: Solve for x
    x = 2,211,075.67/1,978.11
  6. Step 6: Final answer
    x = 1,117.77

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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.