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Finding the Fourth Proportional to 1,378.84, 2,065.50 and 647.44

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Solution

The fourth proportional to 1,378.84, 2,065.50 and 647.44 is: 969.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.84 : 2,065.50 = 647.44 : x
  2. Step 2: Convert to fraction form
    1,378.84/2,065.50 = 647.44/x
  3. Step 3: Cross multiply
    1,378.84x = 2,065.50 × 647.44
  4. Step 4: Simplify right side
    1,378.84x = 1,337,287.32
  5. Step 5: Solve for x
    x = 1,337,287.32/1,378.84
  6. Step 6: Final answer
    x = 969.86

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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.