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Finding the Fourth Proportional to 1,378.05, 2,066.77 and 647.25

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Solution

The fourth proportional to 1,378.05, 2,066.77 and 647.25 is: 970.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.05 : 2,066.77 = 647.25 : x
  2. Step 2: Convert to fraction form
    1,378.05/2,066.77 = 647.25/x
  3. Step 3: Cross multiply
    1,378.05x = 2,066.77 × 647.25
  4. Step 4: Simplify right side
    1,378.05x = 1,337,716.88
  5. Step 5: Solve for x
    x = 1,337,716.88/1,378.05
  6. Step 6: Final answer
    x = 970.73

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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.