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Finding the Fourth Proportional to 1,438.62, 2,158.05 and 616.69

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Solution

The fourth proportional to 1,438.62, 2,158.05 and 616.69 is: 925.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.62 : 2,158.05 = 616.69 : x
  2. Step 2: Convert to fraction form
    1,438.62/2,158.05 = 616.69/x
  3. Step 3: Cross multiply
    1,438.62x = 2,158.05 × 616.69
  4. Step 4: Simplify right side
    1,438.62x = 1,330,850.17
  5. Step 5: Solve for x
    x = 1,330,850.17/1,438.62
  6. Step 6: Final answer
    x = 925.09

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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.