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Finding the Fourth Proportional to 1,378.83, 2,066.36 and 647.13

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Solution

The fourth proportional to 1,378.83, 2,066.36 and 647.13 is: 969.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.83 : 2,066.36 = 647.13 : x
  2. Step 2: Convert to fraction form
    1,378.83/2,066.36 = 647.13/x
  3. Step 3: Cross multiply
    1,378.83x = 2,066.36 × 647.13
  4. Step 4: Simplify right side
    1,378.83x = 1,337,200.31
  5. Step 5: Solve for x
    x = 1,337,200.31/1,378.83
  6. Step 6: Final answer
    x = 969.81

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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.