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Finding the Fourth Proportional to 1,438.98, 2,158.79 and 465.08

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Solution

The fourth proportional to 1,438.98, 2,158.79 and 465.08 is: 697.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.98 : 2,158.79 = 465.08 : x
  2. Step 2: Convert to fraction form
    1,438.98/2,158.79 = 465.08/x
  3. Step 3: Cross multiply
    1,438.98x = 2,158.79 × 465.08
  4. Step 4: Simplify right side
    1,438.98x = 1,003,996.93
  5. Step 5: Solve for x
    x = 1,003,996.93/1,438.98
  6. Step 6: Final answer
    x = 697.71

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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.