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Finding the Fourth Proportional to 780.27, 1,076.78 and 448.68

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Solution

The fourth proportional to 780.27, 1,076.78 and 448.68 is: 619.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.27 : 1,076.78 = 448.68 : x
  2. Step 2: Convert to fraction form
    780.27/1,076.78 = 448.68/x
  3. Step 3: Cross multiply
    780.27x = 1,076.78 × 448.68
  4. Step 4: Simplify right side
    780.27x = 483,129.65
  5. Step 5: Solve for x
    x = 483,129.65/780.27
  6. Step 6: Final answer
    x = 619.18

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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.