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Finding the Fourth Proportional to 930.58, 1,284.02 and 635.74

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Solution

The fourth proportional to 930.58, 1,284.02 and 635.74 is: 877.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.58 : 1,284.02 = 635.74 : x
  2. Step 2: Convert to fraction form
    930.58/1,284.02 = 635.74/x
  3. Step 3: Cross multiply
    930.58x = 1,284.02 × 635.74
  4. Step 4: Simplify right side
    930.58x = 816,298.87
  5. Step 5: Solve for x
    x = 816,298.87/930.58
  6. Step 6: Final answer
    x = 877.20

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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.