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Finding the Fourth Proportional to 1,236.38, 1,854.36 and 870.05

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Solution

The fourth proportional to 1,236.38, 1,854.36 and 870.05 is: 1,304.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.38 : 1,854.36 = 870.05 : x
  2. Step 2: Convert to fraction form
    1,236.38/1,854.36 = 870.05/x
  3. Step 3: Cross multiply
    1,236.38x = 1,854.36 × 870.05
  4. Step 4: Simplify right side
    1,236.38x = 1,613,390.55
  5. Step 5: Solve for x
    x = 1,613,390.55/1,236.38
  6. Step 6: Final answer
    x = 1,304.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.