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Finding the Fourth Proportional to 1,664.12, 2,496.81 and 690.14

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Solution

The fourth proportional to 1,664.12, 2,496.81 and 690.14 is: 1,035.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,664.12 : 2,496.81 = 690.14 : x
  2. Step 2: Convert to fraction form
    1,664.12/2,496.81 = 690.14/x
  3. Step 3: Cross multiply
    1,664.12x = 2,496.81 × 690.14
  4. Step 4: Simplify right side
    1,664.12x = 1,723,148.45
  5. Step 5: Solve for x
    x = 1,723,148.45/1,664.12
  6. Step 6: Final answer
    x = 1,035.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.