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Finding the Fourth Proportional to 913.61, 1,370.49 and 393.62

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Solution

The fourth proportional to 913.61, 1,370.49 and 393.62 is: 590.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.61 : 1,370.49 = 393.62 : x
  2. Step 2: Convert to fraction form
    913.61/1,370.49 = 393.62/x
  3. Step 3: Cross multiply
    913.61x = 1,370.49 × 393.62
  4. Step 4: Simplify right side
    913.61x = 539,455.70
  5. Step 5: Solve for x
    x = 539,455.70/913.61
  6. Step 6: Final answer
    x = 590.46

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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.