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Finding the Fourth Proportional to 775.83, 1,164.07 and 515.91

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Solution

The fourth proportional to 775.83, 1,164.07 and 515.91 is: 774.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.83 : 1,164.07 = 515.91 : x
  2. Step 2: Convert to fraction form
    775.83/1,164.07 = 515.91/x
  3. Step 3: Cross multiply
    775.83x = 1,164.07 × 515.91
  4. Step 4: Simplify right side
    775.83x = 600,555.35
  5. Step 5: Solve for x
    x = 600,555.35/775.83
  6. Step 6: Final answer
    x = 774.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.