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Finding the Fourth Proportional to 1,186, 1,636.64 and 688.61

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Solution

The fourth proportional to 1,186, 1,636.64 and 688.61 is: 950.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186 : 1,636.64 = 688.61 : x
  2. Step 2: Convert to fraction form
    1,186/1,636.64 = 688.61/x
  3. Step 3: Cross multiply
    1,186x = 1,636.64 × 688.61
  4. Step 4: Simplify right side
    1,186x = 1,127,006.67
  5. Step 5: Solve for x
    x = 1,127,006.67/1,186
  6. Step 6: Final answer
    x = 950.26

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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.