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Finding the Fourth Proportional to 804.72, 1,206.90 and 317.88

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Solution

The fourth proportional to 804.72, 1,206.90 and 317.88 is: 476.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.72 : 1,206.90 = 317.88 : x
  2. Step 2: Convert to fraction form
    804.72/1,206.90 = 317.88/x
  3. Step 3: Cross multiply
    804.72x = 1,206.90 × 317.88
  4. Step 4: Simplify right side
    804.72x = 383,649.37
  5. Step 5: Solve for x
    x = 383,649.37/804.72
  6. Step 6: Final answer
    x = 476.75

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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.