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Finding the Fourth Proportional to 1,768.50, 2,651.58 and 781.32

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Solution

The fourth proportional to 1,768.50, 2,651.58 and 781.32 is: 1,171.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,768.50 : 2,651.58 = 781.32 : x
  2. Step 2: Convert to fraction form
    1,768.50/2,651.58 = 781.32/x
  3. Step 3: Cross multiply
    1,768.50x = 2,651.58 × 781.32
  4. Step 4: Simplify right side
    1,768.50x = 2,071,732.49
  5. Step 5: Solve for x
    x = 2,071,732.49/1,768.50
  6. Step 6: Final answer
    x = 1,171.46

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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.