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Finding the Fourth Proportional to 803.42, 1,108.16 and 492.92

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Solution

The fourth proportional to 803.42, 1,108.16 and 492.92 is: 679.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.42 : 1,108.16 = 492.92 : x
  2. Step 2: Convert to fraction form
    803.42/1,108.16 = 492.92/x
  3. Step 3: Cross multiply
    803.42x = 1,108.16 × 492.92
  4. Step 4: Simplify right side
    803.42x = 546,234.23
  5. Step 5: Solve for x
    x = 546,234.23/803.42
  6. Step 6: Final answer
    x = 679.89

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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.