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Finding the Fourth Proportional to 1,187.01, 1,638.63 and 892.38

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Solution

The fourth proportional to 1,187.01, 1,638.63 and 892.38 is: 1,231.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.01 : 1,638.63 = 892.38 : x
  2. Step 2: Convert to fraction form
    1,187.01/1,638.63 = 892.38/x
  3. Step 3: Cross multiply
    1,187.01x = 1,638.63 × 892.38
  4. Step 4: Simplify right side
    1,187.01x = 1,462,280.64
  5. Step 5: Solve for x
    x = 1,462,280.64/1,187.01
  6. Step 6: Final answer
    x = 1,231.90

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1.5x scale

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.