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Finding the Fourth Proportional to 913.54, 1,370.69 and 393.65

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Solution

The fourth proportional to 913.54, 1,370.69 and 393.65 is: 590.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.54 : 1,370.69 = 393.65 : x
  2. Step 2: Convert to fraction form
    913.54/1,370.69 = 393.65/x
  3. Step 3: Cross multiply
    913.54x = 1,370.69 × 393.65
  4. Step 4: Simplify right side
    913.54x = 539,572.12
  5. Step 5: Solve for x
    x = 539,572.12/913.54
  6. Step 6: Final answer
    x = 590.64

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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.