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Finding the Fourth Proportional to 927.12, 1,279.86 and 633.90

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Solution

The fourth proportional to 927.12, 1,279.86 and 633.90 is: 875.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.12 : 1,279.86 = 633.90 : x
  2. Step 2: Convert to fraction form
    927.12/1,279.86 = 633.90/x
  3. Step 3: Cross multiply
    927.12x = 1,279.86 × 633.90
  4. Step 4: Simplify right side
    927.12x = 811,303.25
  5. Step 5: Solve for x
    x = 811,303.25/927.12
  6. Step 6: Final answer
    x = 875.08

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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.