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Finding the Fourth Proportional to 803.32, 1,205.06 and 412.25

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Solution

The fourth proportional to 803.32, 1,205.06 and 412.25 is: 618.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.32 : 1,205.06 = 412.25 : x
  2. Step 2: Convert to fraction form
    803.32/1,205.06 = 412.25/x
  3. Step 3: Cross multiply
    803.32x = 1,205.06 × 412.25
  4. Step 4: Simplify right side
    803.32x = 496,777.90
  5. Step 5: Solve for x
    x = 496,777.90/803.32
  6. Step 6: Final answer
    x = 618.41

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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.