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Finding the Fourth Proportional to 768.20, 1,059.72 and 657.68

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Solution

The fourth proportional to 768.20, 1,059.72 and 657.68 is: 907.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.20 : 1,059.72 = 657.68 : x
  2. Step 2: Convert to fraction form
    768.20/1,059.72 = 657.68/x
  3. Step 3: Cross multiply
    768.20x = 1,059.72 × 657.68
  4. Step 4: Simplify right side
    768.20x = 696,956.65
  5. Step 5: Solve for x
    x = 696,956.65/768.20
  6. Step 6: Final answer
    x = 907.26

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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.