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Finding the Fourth Proportional to 823.95, 1,137.03 and 492.21

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Solution

The fourth proportional to 823.95, 1,137.03 and 492.21 is: 679.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.95 : 1,137.03 = 492.21 : x
  2. Step 2: Convert to fraction form
    823.95/1,137.03 = 492.21/x
  3. Step 3: Cross multiply
    823.95x = 1,137.03 × 492.21
  4. Step 4: Simplify right side
    823.95x = 559,657.54
  5. Step 5: Solve for x
    x = 559,657.54/823.95
  6. Step 6: Final answer
    x = 679.24

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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.