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Finding the Fourth Proportional to 1,165.73, 1,609.19 and 870.49

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Solution

The fourth proportional to 1,165.73, 1,609.19 and 870.49 is: 1,201.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165.73 : 1,609.19 = 870.49 : x
  2. Step 2: Convert to fraction form
    1,165.73/1,609.19 = 870.49/x
  3. Step 3: Cross multiply
    1,165.73x = 1,609.19 × 870.49
  4. Step 4: Simplify right side
    1,165.73x = 1,400,783.80
  5. Step 5: Solve for x
    x = 1,400,783.80/1,165.73
  6. Step 6: Final answer
    x = 1,201.64

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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.