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Finding the Fourth Proportional to 1,236.24, 1,705.68 and 770.40

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Solution

The fourth proportional to 1,236.24, 1,705.68 and 770.40 is: 1,062.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.24 : 1,705.68 = 770.40 : x
  2. Step 2: Convert to fraction form
    1,236.24/1,705.68 = 770.40/x
  3. Step 3: Cross multiply
    1,236.24x = 1,705.68 × 770.40
  4. Step 4: Simplify right side
    1,236.24x = 1,314,055.87
  5. Step 5: Solve for x
    x = 1,314,055.87/1,236.24
  6. Step 6: Final answer
    x = 1,062.95

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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.