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Finding the Fourth Proportional to 775.19, 1,069.83 and 480.63

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Solution

The fourth proportional to 775.19, 1,069.83 and 480.63 is: 663.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.19 : 1,069.83 = 480.63 : x
  2. Step 2: Convert to fraction form
    775.19/1,069.83 = 480.63/x
  3. Step 3: Cross multiply
    775.19x = 1,069.83 × 480.63
  4. Step 4: Simplify right side
    775.19x = 514,196.40
  5. Step 5: Solve for x
    x = 514,196.40/775.19
  6. Step 6: Final answer
    x = 663.31

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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.