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Finding the Fourth Proportional to 778, 1,074 and 623.92

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Solution

The fourth proportional to 778, 1,074 and 623.92 is: 861.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    778 : 1,074 = 623.92 : x
  2. Step 2: Convert to fraction form
    778/1,074 = 623.92/x
  3. Step 3: Cross multiply
    778x = 1,074 × 623.92
  4. Step 4: Simplify right side
    778x = 670,090.08
  5. Step 5: Solve for x
    x = 670,090.08/778
  6. Step 6: Final answer
    x = 861.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.