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Finding the Fourth Proportional to 817.58, 1,128.36 and 768.18

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Solution

The fourth proportional to 817.58, 1,128.36 and 768.18 is: 1,060.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.58 : 1,128.36 = 768.18 : x
  2. Step 2: Convert to fraction form
    817.58/1,128.36 = 768.18/x
  3. Step 3: Cross multiply
    817.58x = 1,128.36 × 768.18
  4. Step 4: Simplify right side
    817.58x = 866,783.58
  5. Step 5: Solve for x
    x = 866,783.58/817.58
  6. Step 6: Final answer
    x = 1,060.18

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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.