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Finding the Fourth Proportional to 779.64, 1,076 and 448.20

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Solution

The fourth proportional to 779.64, 1,076 and 448.20 is: 618.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.64 : 1,076 = 448.20 : x
  2. Step 2: Convert to fraction form
    779.64/1,076 = 448.20/x
  3. Step 3: Cross multiply
    779.64x = 1,076 × 448.20
  4. Step 4: Simplify right side
    779.64x = 482,263.20
  5. Step 5: Solve for x
    x = 482,263.20/779.64
  6. Step 6: Final answer
    x = 618.57

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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.