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Finding the Fourth Proportional to 1,379.45, 2,069.51 and 648.17

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Solution

The fourth proportional to 1,379.45, 2,069.51 and 648.17 is: 972.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.45 : 2,069.51 = 648.17 : x
  2. Step 2: Convert to fraction form
    1,379.45/2,069.51 = 648.17/x
  3. Step 3: Cross multiply
    1,379.45x = 2,069.51 × 648.17
  4. Step 4: Simplify right side
    1,379.45x = 1,341,394.30
  5. Step 5: Solve for x
    x = 1,341,394.30/1,379.45
  6. Step 6: Final answer
    x = 972.41

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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.