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Finding the Fourth Proportional to 1,275.91, 1,914.14 and 398.39

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Solution

The fourth proportional to 1,275.91, 1,914.14 and 398.39 is: 597.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.91 : 1,914.14 = 398.39 : x
  2. Step 2: Convert to fraction form
    1,275.91/1,914.14 = 398.39/x
  3. Step 3: Cross multiply
    1,275.91x = 1,914.14 × 398.39
  4. Step 4: Simplify right side
    1,275.91x = 762,572.24
  5. Step 5: Solve for x
    x = 762,572.24/1,275.91
  6. Step 6: Final answer
    x = 597.67

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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.