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Finding the Fourth Proportional to 775.14, 1,069.40 and 513

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Solution

The fourth proportional to 775.14, 1,069.40 and 513 is: 707.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.14 : 1,069.40 = 513 : x
  2. Step 2: Convert to fraction form
    775.14/1,069.40 = 513/x
  3. Step 3: Cross multiply
    775.14x = 1,069.40 × 513
  4. Step 4: Simplify right side
    775.14x = 548,603.48
  5. Step 5: Solve for x
    x = 548,603.48/775.14
  6. Step 6: Final answer
    x = 707.75

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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.