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Finding the Fourth Proportional to 1,364.10, 2,043.68 and 778.38

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Solution

The fourth proportional to 1,364.10, 2,043.68 and 778.38 is: 1,166.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,364.10 : 2,043.68 = 778.38 : x
  2. Step 2: Convert to fraction form
    1,364.10/2,043.68 = 778.38/x
  3. Step 3: Cross multiply
    1,364.10x = 2,043.68 × 778.38
  4. Step 4: Simplify right side
    1,364.10x = 1,590,755.75
  5. Step 5: Solve for x
    x = 1,590,755.75/1,364.10
  6. Step 6: Final answer
    x = 1,166.16

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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.