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Finding the Fourth Proportional to 1,186.09, 1,636.82 and 688.75

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Solution

The fourth proportional to 1,186.09, 1,636.82 and 688.75 is: 950.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.09 : 1,636.82 = 688.75 : x
  2. Step 2: Convert to fraction form
    1,186.09/1,636.82 = 688.75/x
  3. Step 3: Cross multiply
    1,186.09x = 1,636.82 × 688.75
  4. Step 4: Simplify right side
    1,186.09x = 1,127,356.33
  5. Step 5: Solve for x
    x = 1,127,356.33/1,186.09
  6. Step 6: Final answer
    x = 950.48

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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.