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Finding the Fourth Proportional to 1,378.75, 2,068.32 and 648.53

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Solution

The fourth proportional to 1,378.75, 2,068.32 and 648.53 is: 972.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.75 : 2,068.32 = 648.53 : x
  2. Step 2: Convert to fraction form
    1,378.75/2,068.32 = 648.53/x
  3. Step 3: Cross multiply
    1,378.75x = 2,068.32 × 648.53
  4. Step 4: Simplify right side
    1,378.75x = 1,341,367.57
  5. Step 5: Solve for x
    x = 1,341,367.57/1,378.75
  6. Step 6: Final answer
    x = 972.89

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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.