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Finding the Fourth Proportional to 790.90, 1,186.67 and 617.30

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Solution

The fourth proportional to 790.90, 1,186.67 and 617.30 is: 926.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.90 : 1,186.67 = 617.30 : x
  2. Step 2: Convert to fraction form
    790.90/1,186.67 = 617.30/x
  3. Step 3: Cross multiply
    790.90x = 1,186.67 × 617.30
  4. Step 4: Simplify right side
    790.90x = 732,531.39
  5. Step 5: Solve for x
    x = 732,531.39/790.90
  6. Step 6: Final answer
    x = 926.20

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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.