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Finding the Fourth Proportional to 913.37, 1,370.50 and 426.76

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Solution

The fourth proportional to 913.37, 1,370.50 and 426.76 is: 640.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.37 : 1,370.50 = 426.76 : x
  2. Step 2: Convert to fraction form
    913.37/1,370.50 = 426.76/x
  3. Step 3: Cross multiply
    913.37x = 1,370.50 × 426.76
  4. Step 4: Simplify right side
    913.37x = 584,870.09
  5. Step 5: Solve for x
    x = 584,870.09/913.37
  6. Step 6: Final answer
    x = 640.35

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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.