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Finding the Fourth Proportional to 804.20, 1,206.18 and 256.32

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Solution

The fourth proportional to 804.20, 1,206.18 and 256.32 is: 384.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.20 : 1,206.18 = 256.32 : x
  2. Step 2: Convert to fraction form
    804.20/1,206.18 = 256.32/x
  3. Step 3: Cross multiply
    804.20x = 1,206.18 × 256.32
  4. Step 4: Simplify right side
    804.20x = 309,168.06
  5. Step 5: Solve for x
    x = 309,168.06/804.20
  6. Step 6: Final answer
    x = 384.44

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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.