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Finding the Fourth Proportional to 913.30, 1,369.34 and 426.08

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Solution

The fourth proportional to 913.30, 1,369.34 and 426.08 is: 638.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.30 : 1,369.34 = 426.08 : x
  2. Step 2: Convert to fraction form
    913.30/1,369.34 = 426.08/x
  3. Step 3: Cross multiply
    913.30x = 1,369.34 × 426.08
  4. Step 4: Simplify right side
    913.30x = 583,448.39
  5. Step 5: Solve for x
    x = 583,448.39/913.30
  6. Step 6: Final answer
    x = 638.84

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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.