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Finding the Fourth Proportional to 780.12, 1,076.31 and 448.47

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Solution

The fourth proportional to 780.12, 1,076.31 and 448.47 is: 618.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.12 : 1,076.31 = 448.47 : x
  2. Step 2: Convert to fraction form
    780.12/1,076.31 = 448.47/x
  3. Step 3: Cross multiply
    780.12x = 1,076.31 × 448.47
  4. Step 4: Simplify right side
    780.12x = 482,692.75
  5. Step 5: Solve for x
    x = 482,692.75/780.12
  6. Step 6: Final answer
    x = 618.74

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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.