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Finding the Fourth Proportional to 792.51, 1,091.07 and 688.95

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Solution

The fourth proportional to 792.51, 1,091.07 and 688.95 is: 948.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.51 : 1,091.07 = 688.95 : x
  2. Step 2: Convert to fraction form
    792.51/1,091.07 = 688.95/x
  3. Step 3: Cross multiply
    792.51x = 1,091.07 × 688.95
  4. Step 4: Simplify right side
    792.51x = 751,692.68
  5. Step 5: Solve for x
    x = 751,692.68/792.51
  6. Step 6: Final answer
    x = 948.50

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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.