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Finding the Fourth Proportional to 803.93, 1,205.89 and 316.91

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Solution

The fourth proportional to 803.93, 1,205.89 and 316.91 is: 475.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.93 : 1,205.89 = 316.91 : x
  2. Step 2: Convert to fraction form
    803.93/1,205.89 = 316.91/x
  3. Step 3: Cross multiply
    803.93x = 1,205.89 × 316.91
  4. Step 4: Simplify right side
    803.93x = 382,160.82
  5. Step 5: Solve for x
    x = 382,160.82/803.93
  6. Step 6: Final answer
    x = 475.37

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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.