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Finding the Fourth Proportional to 790.43, 1,186.23 and 638.18

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Solution

The fourth proportional to 790.43, 1,186.23 and 638.18 is: 957.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.43 : 1,186.23 = 638.18 : x
  2. Step 2: Convert to fraction form
    790.43/1,186.23 = 638.18/x
  3. Step 3: Cross multiply
    790.43x = 1,186.23 × 638.18
  4. Step 4: Simplify right side
    790.43x = 757,028.26
  5. Step 5: Solve for x
    x = 757,028.26/790.43
  6. Step 6: Final answer
    x = 957.74

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Double scale
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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.