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Finding the Fourth Proportional to 803.95, 1,109.62 and 489.31

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Solution

The fourth proportional to 803.95, 1,109.62 and 489.31 is: 675.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.95 : 1,109.62 = 489.31 : x
  2. Step 2: Convert to fraction form
    803.95/1,109.62 = 489.31/x
  3. Step 3: Cross multiply
    803.95x = 1,109.62 × 489.31
  4. Step 4: Simplify right side
    803.95x = 542,951.24
  5. Step 5: Solve for x
    x = 542,951.24/803.95
  6. Step 6: Final answer
    x = 675.36

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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.