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Finding the Fourth Proportional to 790.10, 1,185.16 and 443.38

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Solution

The fourth proportional to 790.10, 1,185.16 and 443.38 is: 665.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.10 : 1,185.16 = 443.38 : x
  2. Step 2: Convert to fraction form
    790.10/1,185.16 = 443.38/x
  3. Step 3: Cross multiply
    790.10x = 1,185.16 × 443.38
  4. Step 4: Simplify right side
    790.10x = 525,476.24
  5. Step 5: Solve for x
    x = 525,476.24/790.10
  6. Step 6: Final answer
    x = 665.08

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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.