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Finding the Fourth Proportional to 1,178.92, 1,625.38 and 785.64

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Solution

The fourth proportional to 1,178.92, 1,625.38 and 785.64 is: 1,083.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.92 : 1,625.38 = 785.64 : x
  2. Step 2: Convert to fraction form
    1,178.92/1,625.38 = 785.64/x
  3. Step 3: Cross multiply
    1,178.92x = 1,625.38 × 785.64
  4. Step 4: Simplify right side
    1,178.92x = 1,276,963.54
  5. Step 5: Solve for x
    x = 1,276,963.54/1,178.92
  6. Step 6: Final answer
    x = 1,083.16

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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.