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Finding the Fourth Proportional to 765.93, 1,148.79 and 419.65

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Solution

The fourth proportional to 765.93, 1,148.79 and 419.65 is: 629.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.93 : 1,148.79 = 419.65 : x
  2. Step 2: Convert to fraction form
    765.93/1,148.79 = 419.65/x
  3. Step 3: Cross multiply
    765.93x = 1,148.79 × 419.65
  4. Step 4: Simplify right side
    765.93x = 482,089.72
  5. Step 5: Solve for x
    x = 482,089.72/765.93
  6. Step 6: Final answer
    x = 629.42

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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.