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Finding the Fourth Proportional to 913.89, 1,370.79 and 328.87

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Solution

The fourth proportional to 913.89, 1,370.79 and 328.87 is: 493.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.89 : 1,370.79 = 328.87 : x
  2. Step 2: Convert to fraction form
    913.89/1,370.79 = 328.87/x
  3. Step 3: Cross multiply
    913.89x = 1,370.79 × 328.87
  4. Step 4: Simplify right side
    913.89x = 450,811.71
  5. Step 5: Solve for x
    x = 450,811.71/913.89
  6. Step 6: Final answer
    x = 493.29

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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.