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Finding the Fourth Proportional to 780.21, 1,076.57 and 448.65

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Solution

The fourth proportional to 780.21, 1,076.57 and 448.65 is: 619.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.21 : 1,076.57 = 448.65 : x
  2. Step 2: Convert to fraction form
    780.21/1,076.57 = 448.65/x
  3. Step 3: Cross multiply
    780.21x = 1,076.57 × 448.65
  4. Step 4: Simplify right side
    780.21x = 483,004.25
  5. Step 5: Solve for x
    x = 483,004.25/780.21
  6. Step 6: Final answer
    x = 619.07

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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.