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Finding the Fourth Proportional to 786.28, 1,085.58 and 491.96

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Solution

The fourth proportional to 786.28, 1,085.58 and 491.96 is: 679.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.28 : 1,085.58 = 491.96 : x
  2. Step 2: Convert to fraction form
    786.28/1,085.58 = 491.96/x
  3. Step 3: Cross multiply
    786.28x = 1,085.58 × 491.96
  4. Step 4: Simplify right side
    786.28x = 534,061.94
  5. Step 5: Solve for x
    x = 534,061.94/786.28
  6. Step 6: Final answer
    x = 679.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.