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Finding the Fourth Proportional to 790.72, 1,185.72 and 328.12

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Solution

The fourth proportional to 790.72, 1,185.72 and 328.12 is: 492.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.72 : 1,185.72 = 328.12 : x
  2. Step 2: Convert to fraction form
    790.72/1,185.72 = 328.12/x
  3. Step 3: Cross multiply
    790.72x = 1,185.72 × 328.12
  4. Step 4: Simplify right side
    790.72x = 389,058.45
  5. Step 5: Solve for x
    x = 389,058.45/790.72
  6. Step 6: Final answer
    x = 492.03

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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.