Home / 1,187.11-1,637.89-663.13

Finding the Fourth Proportional to 1,187.11, 1,637.89 and 663.13

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Solution

The fourth proportional to 1,187.11, 1,637.89 and 663.13 is: 914.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.11 : 1,637.89 = 663.13 : x
  2. Step 2: Convert to fraction form
    1,187.11/1,637.89 = 663.13/x
  3. Step 3: Cross multiply
    1,187.11x = 1,637.89 × 663.13
  4. Step 4: Simplify right side
    1,187.11x = 1,086,134.00
  5. Step 5: Solve for x
    x = 1,086,134.00/1,187.11
  6. Step 6: Final answer
    x = 914.94

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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.