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Finding the Fourth Proportional to 1,186.53, 1,637.76 and 689.39

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Solution

The fourth proportional to 1,186.53, 1,637.76 and 689.39 is: 951.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.53 : 1,637.76 = 689.39 : x
  2. Step 2: Convert to fraction form
    1,186.53/1,637.76 = 689.39/x
  3. Step 3: Cross multiply
    1,186.53x = 1,637.76 × 689.39
  4. Step 4: Simplify right side
    1,186.53x = 1,129,055.37
  5. Step 5: Solve for x
    x = 1,129,055.37/1,186.53
  6. Step 6: Final answer
    x = 951.56

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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.