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Finding the Fourth Proportional to 1,185.85, 1,636.25 and 688.31

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Solution

The fourth proportional to 1,185.85, 1,636.25 and 688.31 is: 949.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.85 : 1,636.25 = 688.31 : x
  2. Step 2: Convert to fraction form
    1,185.85/1,636.25 = 688.31/x
  3. Step 3: Cross multiply
    1,185.85x = 1,636.25 × 688.31
  4. Step 4: Simplify right side
    1,185.85x = 1,126,247.24
  5. Step 5: Solve for x
    x = 1,126,247.24/1,185.85
  6. Step 6: Final answer
    x = 949.74

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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.