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Finding the Fourth Proportional to 790.49, 1,186.11 and 328.64

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Solution

The fourth proportional to 790.49, 1,186.11 and 328.64 is: 493.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.49 : 1,186.11 = 328.64 : x
  2. Step 2: Convert to fraction form
    790.49/1,186.11 = 328.64/x
  3. Step 3: Cross multiply
    790.49x = 1,186.11 × 328.64
  4. Step 4: Simplify right side
    790.49x = 389,797.26
  5. Step 5: Solve for x
    x = 389,797.26/790.49
  6. Step 6: Final answer
    x = 493.11

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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.