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Finding the Fourth Proportional to 1,438.93, 2,158.14 and 398.68

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Solution

The fourth proportional to 1,438.93, 2,158.14 and 398.68 is: 597.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.93 : 2,158.14 = 398.68 : x
  2. Step 2: Convert to fraction form
    1,438.93/2,158.14 = 398.68/x
  3. Step 3: Cross multiply
    1,438.93x = 2,158.14 × 398.68
  4. Step 4: Simplify right side
    1,438.93x = 860,407.26
  5. Step 5: Solve for x
    x = 860,407.26/1,438.93
  6. Step 6: Final answer
    x = 597.95

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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.