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Finding the Fourth Proportional to 1,438.86, 2,158.41 and 398.86

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Solution

The fourth proportional to 1,438.86, 2,158.41 and 398.86 is: 598.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.86 : 2,158.41 = 398.86 : x
  2. Step 2: Convert to fraction form
    1,438.86/2,158.41 = 398.86/x
  3. Step 3: Cross multiply
    1,438.86x = 2,158.41 × 398.86
  4. Step 4: Simplify right side
    1,438.86x = 860,901.42
  5. Step 5: Solve for x
    x = 860,901.42/1,438.86
  6. Step 6: Final answer
    x = 598.32

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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.