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Finding the Fourth Proportional to 931.10, 1,284.86 and 636.46

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Solution

The fourth proportional to 931.10, 1,284.86 and 636.46 is: 878.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.10 : 1,284.86 = 636.46 : x
  2. Step 2: Convert to fraction form
    931.10/1,284.86 = 636.46/x
  3. Step 3: Cross multiply
    931.10x = 1,284.86 × 636.46
  4. Step 4: Simplify right side
    931.10x = 817,760.37
  5. Step 5: Solve for x
    x = 817,760.37/931.10
  6. Step 6: Final answer
    x = 878.28

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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.