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Finding the Fourth Proportional to 775.08, 1,069.60 and 420.99

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Solution

The fourth proportional to 775.08, 1,069.60 and 420.99 is: 580.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.08 : 1,069.60 = 420.99 : x
  2. Step 2: Convert to fraction form
    775.08/1,069.60 = 420.99/x
  3. Step 3: Cross multiply
    775.08x = 1,069.60 × 420.99
  4. Step 4: Simplify right side
    775.08x = 450,290.90
  5. Step 5: Solve for x
    x = 450,290.90/775.08
  6. Step 6: Final answer
    x = 580.96

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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.