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Finding the Fourth Proportional to 1,076.40, 1,613.80 and 391.92

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Solution

The fourth proportional to 1,076.40, 1,613.80 and 391.92 is: 587.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.40 : 1,613.80 = 391.92 : x
  2. Step 2: Convert to fraction form
    1,076.40/1,613.80 = 391.92/x
  3. Step 3: Cross multiply
    1,076.40x = 1,613.80 × 391.92
  4. Step 4: Simplify right side
    1,076.40x = 632,480.50
  5. Step 5: Solve for x
    x = 632,480.50/1,076.40
  6. Step 6: Final answer
    x = 587.59

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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.