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Finding the Fourth Proportional to 931.58, 1,284.74 and 721.09

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Solution

The fourth proportional to 931.58, 1,284.74 and 721.09 is: 994.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.58 : 1,284.74 = 721.09 : x
  2. Step 2: Convert to fraction form
    931.58/1,284.74 = 721.09/x
  3. Step 3: Cross multiply
    931.58x = 1,284.74 × 721.09
  4. Step 4: Simplify right side
    931.58x = 926,406.35
  5. Step 5: Solve for x
    x = 926,406.35/931.58
  6. Step 6: Final answer
    x = 994.44

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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.