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Finding the Fourth Proportional to 803.92, 1,206.36 and 317.20

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Solution

The fourth proportional to 803.92, 1,206.36 and 317.20 is: 475.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.92 : 1,206.36 = 317.20 : x
  2. Step 2: Convert to fraction form
    803.92/1,206.36 = 317.20/x
  3. Step 3: Cross multiply
    803.92x = 1,206.36 × 317.20
  4. Step 4: Simplify right side
    803.92x = 382,657.39
  5. Step 5: Solve for x
    x = 382,657.39/803.92
  6. Step 6: Final answer
    x = 475.99

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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.