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Finding the Fourth Proportional to 1,187.01, 1,784.45 and 842.81

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Solution

The fourth proportional to 1,187.01, 1,784.45 and 842.81 is: 1,267.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.01 : 1,784.45 = 842.81 : x
  2. Step 2: Convert to fraction form
    1,187.01/1,784.45 = 842.81/x
  3. Step 3: Cross multiply
    1,187.01x = 1,784.45 × 842.81
  4. Step 4: Simplify right side
    1,187.01x = 1,503,952.30
  5. Step 5: Solve for x
    x = 1,503,952.30/1,187.01
  6. Step 6: Final answer
    x = 1,267.01

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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.