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Finding the Fourth Proportional to 1,186.17, 1,636.89 and 688.80

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Solution

The fourth proportional to 1,186.17, 1,636.89 and 688.80 is: 950.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.17 : 1,636.89 = 688.80 : x
  2. Step 2: Convert to fraction form
    1,186.17/1,636.89 = 688.80/x
  3. Step 3: Cross multiply
    1,186.17x = 1,636.89 × 688.80
  4. Step 4: Simplify right side
    1,186.17x = 1,127,485.74
  5. Step 5: Solve for x
    x = 1,127,485.74/1,186.17
  6. Step 6: Final answer
    x = 950.52

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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.