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Finding the Fourth Proportional to 949.68, 1,311.16 and 618.64

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Solution

The fourth proportional to 949.68, 1,311.16 and 618.64 is: 854.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.68 : 1,311.16 = 618.64 : x
  2. Step 2: Convert to fraction form
    949.68/1,311.16 = 618.64/x
  3. Step 3: Cross multiply
    949.68x = 1,311.16 × 618.64
  4. Step 4: Simplify right side
    949.68x = 811,136.02
  5. Step 5: Solve for x
    x = 811,136.02/949.68
  6. Step 6: Final answer
    x = 854.12

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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.