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Finding the Fourth Proportional to 913.34, 1,369.37 and 620.12

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Solution

The fourth proportional to 913.34, 1,369.37 and 620.12 is: 929.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.34 : 1,369.37 = 620.12 : x
  2. Step 2: Convert to fraction form
    913.34/1,369.37 = 620.12/x
  3. Step 3: Cross multiply
    913.34x = 1,369.37 × 620.12
  4. Step 4: Simplify right side
    913.34x = 849,178.70
  5. Step 5: Solve for x
    x = 849,178.70/913.34
  6. Step 6: Final answer
    x = 929.75

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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.