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Finding the Fourth Proportional to 775.46, 1,070.05 and 443.99

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Solution

The fourth proportional to 775.46, 1,070.05 and 443.99 is: 612.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.46 : 1,070.05 = 443.99 : x
  2. Step 2: Convert to fraction form
    775.46/1,070.05 = 443.99/x
  3. Step 3: Cross multiply
    775.46x = 1,070.05 × 443.99
  4. Step 4: Simplify right side
    775.46x = 475,091.50
  5. Step 5: Solve for x
    x = 475,091.50/775.46
  6. Step 6: Final answer
    x = 612.66

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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.