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Finding the Fourth Proportional to 779.99, 1,076.54 and 448.64

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Solution

The fourth proportional to 779.99, 1,076.54 and 448.64 is: 619.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.99 : 1,076.54 = 448.64 : x
  2. Step 2: Convert to fraction form
    779.99/1,076.54 = 448.64/x
  3. Step 3: Cross multiply
    779.99x = 1,076.54 × 448.64
  4. Step 4: Simplify right side
    779.99x = 482,978.91
  5. Step 5: Solve for x
    x = 482,978.91/779.99
  6. Step 6: Final answer
    x = 619.21

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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.