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Finding the Fourth Proportional to 1,188.33, 1,640.04 and 690.87

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Solution

The fourth proportional to 1,188.33, 1,640.04 and 690.87 is: 953.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.33 : 1,640.04 = 690.87 : x
  2. Step 2: Convert to fraction form
    1,188.33/1,640.04 = 690.87/x
  3. Step 3: Cross multiply
    1,188.33x = 1,640.04 × 690.87
  4. Step 4: Simplify right side
    1,188.33x = 1,133,054.43
  5. Step 5: Solve for x
    x = 1,133,054.43/1,188.33
  6. Step 6: Final answer
    x = 953.48

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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.