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Finding the Fourth Proportional to 949.85, 1,310.77 and 618.90

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Solution

The fourth proportional to 949.85, 1,310.77 and 618.90 is: 854.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.85 : 1,310.77 = 618.90 : x
  2. Step 2: Convert to fraction form
    949.85/1,310.77 = 618.90/x
  3. Step 3: Cross multiply
    949.85x = 1,310.77 × 618.90
  4. Step 4: Simplify right side
    949.85x = 811,235.55
  5. Step 5: Solve for x
    x = 811,235.55/949.85
  6. Step 6: Final answer
    x = 854.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.