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Finding the Fourth Proportional to 803.64, 1,205.40 and 316.70

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Solution

The fourth proportional to 803.64, 1,205.40 and 316.70 is: 475.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.64 : 1,205.40 = 316.70 : x
  2. Step 2: Convert to fraction form
    803.64/1,205.40 = 316.70/x
  3. Step 3: Cross multiply
    803.64x = 1,205.40 × 316.70
  4. Step 4: Simplify right side
    803.64x = 381,743.36
  5. Step 5: Solve for x
    x = 381,743.36/803.64
  6. Step 6: Final answer
    x = 475.02

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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.