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Finding the Fourth Proportional to 779.95, 1,076.51 and 448.57

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Solution

The fourth proportional to 779.95, 1,076.51 and 448.57 is: 619.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.95 : 1,076.51 = 448.57 : x
  2. Step 2: Convert to fraction form
    779.95/1,076.51 = 448.57/x
  3. Step 3: Cross multiply
    779.95x = 1,076.51 × 448.57
  4. Step 4: Simplify right side
    779.95x = 482,890.09
  5. Step 5: Solve for x
    x = 482,890.09/779.95
  6. Step 6: Final answer
    x = 619.13

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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.