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Finding the Fourth Proportional to 768.07, 1,150.08 and 420.58

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Solution

The fourth proportional to 768.07, 1,150.08 and 420.58 is: 629.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.07 : 1,150.08 = 420.58 : x
  2. Step 2: Convert to fraction form
    768.07/1,150.08 = 420.58/x
  3. Step 3: Cross multiply
    768.07x = 1,150.08 × 420.58
  4. Step 4: Simplify right side
    768.07x = 483,700.65
  5. Step 5: Solve for x
    x = 483,700.65/768.07
  6. Step 6: Final answer
    x = 629.76

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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.