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Finding the Fourth Proportional to 777.30, 1,072.94 and 515.40

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Solution

The fourth proportional to 777.30, 1,072.94 and 515.40 is: 711.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.30 : 1,072.94 = 515.40 : x
  2. Step 2: Convert to fraction form
    777.30/1,072.94 = 515.40/x
  3. Step 3: Cross multiply
    777.30x = 1,072.94 × 515.40
  4. Step 4: Simplify right side
    777.30x = 552,993.28
  5. Step 5: Solve for x
    x = 552,993.28/777.30
  6. Step 6: Final answer
    x = 711.43

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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.