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Finding the Fourth Proportional to 913.40, 1,369.20 and 450.80

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Solution

The fourth proportional to 913.40, 1,369.20 and 450.80 is: 675.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.40 : 1,369.20 = 450.80 : x
  2. Step 2: Convert to fraction form
    913.40/1,369.20 = 450.80/x
  3. Step 3: Cross multiply
    913.40x = 1,369.20 × 450.80
  4. Step 4: Simplify right side
    913.40x = 617,235.36
  5. Step 5: Solve for x
    x = 617,235.36/913.40
  6. Step 6: Final answer
    x = 675.76

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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.