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Finding the Fourth Proportional to 803.78, 1,205.58 and 317.18

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Solution

The fourth proportional to 803.78, 1,205.58 and 317.18 is: 475.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.78 : 1,205.58 = 317.18 : x
  2. Step 2: Convert to fraction form
    803.78/1,205.58 = 317.18/x
  3. Step 3: Cross multiply
    803.78x = 1,205.58 × 317.18
  4. Step 4: Simplify right side
    803.78x = 382,385.86
  5. Step 5: Solve for x
    x = 382,385.86/803.78
  6. Step 6: Final answer
    x = 475.73

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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.