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Finding the Fourth Proportional to 775.04, 1,069.40 and 480.38

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Solution

The fourth proportional to 775.04, 1,069.40 and 480.38 is: 662.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.04 : 1,069.40 = 480.38 : x
  2. Step 2: Convert to fraction form
    775.04/1,069.40 = 480.38/x
  3. Step 3: Cross multiply
    775.04x = 1,069.40 × 480.38
  4. Step 4: Simplify right side
    775.04x = 513,714.23
  5. Step 5: Solve for x
    x = 513,714.23/775.04
  6. Step 6: Final answer
    x = 662.83

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Double scale
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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.