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Finding the Fourth Proportional to 775.79, 1,072.10 and 576.92

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Solution

The fourth proportional to 775.79, 1,072.10 and 576.92 is: 797.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.79 : 1,072.10 = 576.92 : x
  2. Step 2: Convert to fraction form
    775.79/1,072.10 = 576.92/x
  3. Step 3: Cross multiply
    775.79x = 1,072.10 × 576.92
  4. Step 4: Simplify right side
    775.79x = 618,520.05
  5. Step 5: Solve for x
    x = 618,520.05/775.79
  6. Step 6: Final answer
    x = 797.27

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1.5x scale

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.