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Finding the Fourth Proportional to 1,263.25, 1,742.79 and 790.95

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Solution

The fourth proportional to 1,263.25, 1,742.79 and 790.95 is: 1,091.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.25 : 1,742.79 = 790.95 : x
  2. Step 2: Convert to fraction form
    1,263.25/1,742.79 = 790.95/x
  3. Step 3: Cross multiply
    1,263.25x = 1,742.79 × 790.95
  4. Step 4: Simplify right side
    1,263.25x = 1,378,459.75
  5. Step 5: Solve for x
    x = 1,378,459.75/1,263.25
  6. Step 6: Final answer
    x = 1,091.20

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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.