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Finding the Fourth Proportional to 919.34, 1,266.90 and 762.20

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Solution

The fourth proportional to 919.34, 1,266.90 and 762.20 is: 1,050.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.34 : 1,266.90 = 762.20 : x
  2. Step 2: Convert to fraction form
    919.34/1,266.90 = 762.20/x
  3. Step 3: Cross multiply
    919.34x = 1,266.90 × 762.20
  4. Step 4: Simplify right side
    919.34x = 965,631.18
  5. Step 5: Solve for x
    x = 965,631.18/919.34
  6. Step 6: Final answer
    x = 1,050.35

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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.