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Finding the Fourth Proportional to 775.77, 1,069.54 and 495.53

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Solution

The fourth proportional to 775.77, 1,069.54 and 495.53 is: 683.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.77 : 1,069.54 = 495.53 : x
  2. Step 2: Convert to fraction form
    775.77/1,069.54 = 495.53/x
  3. Step 3: Cross multiply
    775.77x = 1,069.54 × 495.53
  4. Step 4: Simplify right side
    775.77x = 529,989.16
  5. Step 5: Solve for x
    x = 529,989.16/775.77
  6. Step 6: Final answer
    x = 683.18

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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.