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Finding the Fourth Proportional to 913.86, 1,370.92 and 336.69

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Solution

The fourth proportional to 913.86, 1,370.92 and 336.69 is: 505.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.86 : 1,370.92 = 336.69 : x
  2. Step 2: Convert to fraction form
    913.86/1,370.92 = 336.69/x
  3. Step 3: Cross multiply
    913.86x = 1,370.92 × 336.69
  4. Step 4: Simplify right side
    913.86x = 461,575.05
  5. Step 5: Solve for x
    x = 461,575.05/913.86
  6. Step 6: Final answer
    x = 505.08

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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.