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Finding the Fourth Proportional to 2,690.47, 4,035.70 and 958.69

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Solution

The fourth proportional to 2,690.47, 4,035.70 and 958.69 is: 1,438.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,690.47 : 4,035.70 = 958.69 : x
  2. Step 2: Convert to fraction form
    2,690.47/4,035.70 = 958.69/x
  3. Step 3: Cross multiply
    2,690.47x = 4,035.70 × 958.69
  4. Step 4: Simplify right side
    2,690.47x = 3,868,965.05
  5. Step 5: Solve for x
    x = 3,868,965.05/2,690.47
  6. Step 6: Final answer
    x = 1,438.03

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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.