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Finding the Fourth Proportional to 1,424.72, 2,137.20 and 398.72

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Solution

The fourth proportional to 1,424.72, 2,137.20 and 398.72 is: 598.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,424.72 : 2,137.20 = 398.72 : x
  2. Step 2: Convert to fraction form
    1,424.72/2,137.20 = 398.72/x
  3. Step 3: Cross multiply
    1,424.72x = 2,137.20 × 398.72
  4. Step 4: Simplify right side
    1,424.72x = 852,144.38
  5. Step 5: Solve for x
    x = 852,144.38/1,424.72
  6. Step 6: Final answer
    x = 598.11

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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.