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Finding the Fourth Proportional to 930.56, 1,394.36 and 491.80

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Solution

The fourth proportional to 930.56, 1,394.36 and 491.80 is: 736.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.56 : 1,394.36 = 491.80 : x
  2. Step 2: Convert to fraction form
    930.56/1,394.36 = 491.80/x
  3. Step 3: Cross multiply
    930.56x = 1,394.36 × 491.80
  4. Step 4: Simplify right side
    930.56x = 685,746.25
  5. Step 5: Solve for x
    x = 685,746.25/930.56
  6. Step 6: Final answer
    x = 736.92

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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.