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Finding the Fourth Proportional to 777.55, 1,072.31 and 515.11

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Solution

The fourth proportional to 777.55, 1,072.31 and 515.11 is: 710.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.55 : 1,072.31 = 515.11 : x
  2. Step 2: Convert to fraction form
    777.55/1,072.31 = 515.11/x
  3. Step 3: Cross multiply
    777.55x = 1,072.31 × 515.11
  4. Step 4: Simplify right side
    777.55x = 552,358.70
  5. Step 5: Solve for x
    x = 552,358.70/777.55
  6. Step 6: Final answer
    x = 710.38

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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.