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Finding the Fourth Proportional to 1,438.65, 2,158.34 and 464.85

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Solution

The fourth proportional to 1,438.65, 2,158.34 and 464.85 is: 697.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.65 : 2,158.34 = 464.85 : x
  2. Step 2: Convert to fraction form
    1,438.65/2,158.34 = 464.85/x
  3. Step 3: Cross multiply
    1,438.65x = 2,158.34 × 464.85
  4. Step 4: Simplify right side
    1,438.65x = 1,003,302.02
  5. Step 5: Solve for x
    x = 1,003,302.02/1,438.65
  6. Step 6: Final answer
    x = 697.39

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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.