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Finding the Fourth Proportional to 803.42, 1,108.73 and 488.69

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Solution

The fourth proportional to 803.42, 1,108.73 and 488.69 is: 674.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.42 : 1,108.73 = 488.69 : x
  2. Step 2: Convert to fraction form
    803.42/1,108.73 = 488.69/x
  3. Step 3: Cross multiply
    803.42x = 1,108.73 × 488.69
  4. Step 4: Simplify right side
    803.42x = 541,829.18
  5. Step 5: Solve for x
    x = 541,829.18/803.42
  6. Step 6: Final answer
    x = 674.41

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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.