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Finding the Fourth Proportional to 818.95, 1,228.05 and 490.03

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Solution

The fourth proportional to 818.95, 1,228.05 and 490.03 is: 734.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.95 : 1,228.05 = 490.03 : x
  2. Step 2: Convert to fraction form
    818.95/1,228.05 = 490.03/x
  3. Step 3: Cross multiply
    818.95x = 1,228.05 × 490.03
  4. Step 4: Simplify right side
    818.95x = 601,781.34
  5. Step 5: Solve for x
    x = 601,781.34/818.95
  6. Step 6: Final answer
    x = 734.82

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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.