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Finding the Fourth Proportional to 931.22, 1,284.44 and 636.89

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Solution

The fourth proportional to 931.22, 1,284.44 and 636.89 is: 878.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.22 : 1,284.44 = 636.89 : x
  2. Step 2: Convert to fraction form
    931.22/1,284.44 = 636.89/x
  3. Step 3: Cross multiply
    931.22x = 1,284.44 × 636.89
  4. Step 4: Simplify right side
    931.22x = 818,037.38
  5. Step 5: Solve for x
    x = 818,037.38/931.22
  6. Step 6: Final answer
    x = 878.46

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1.5x scale

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.