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Finding the Fourth Proportional to 780.41, 1,076.95 and 448.77

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Solution

The fourth proportional to 780.41, 1,076.95 and 448.77 is: 619.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.41 : 1,076.95 = 448.77 : x
  2. Step 2: Convert to fraction form
    780.41/1,076.95 = 448.77/x
  3. Step 3: Cross multiply
    780.41x = 1,076.95 × 448.77
  4. Step 4: Simplify right side
    780.41x = 483,302.85
  5. Step 5: Solve for x
    x = 483,302.85/780.41
  6. Step 6: Final answer
    x = 619.29

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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.