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Finding the Fourth Proportional to 1,285.39, 1,773.87 and 788.53

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Solution

The fourth proportional to 1,285.39, 1,773.87 and 788.53 is: 1,088.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.39 : 1,773.87 = 788.53 : x
  2. Step 2: Convert to fraction form
    1,285.39/1,773.87 = 788.53/x
  3. Step 3: Cross multiply
    1,285.39x = 1,773.87 × 788.53
  4. Step 4: Simplify right side
    1,285.39x = 1,398,745.28
  5. Step 5: Solve for x
    x = 1,398,745.28/1,285.39
  6. Step 6: Final answer
    x = 1,088.19

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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.