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Finding the Fourth Proportional to 1,151.89, 1,728 and 421.30

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Solution

The fourth proportional to 1,151.89, 1,728 and 421.30 is: 632.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.89 : 1,728 = 421.30 : x
  2. Step 2: Convert to fraction form
    1,151.89/1,728 = 421.30/x
  3. Step 3: Cross multiply
    1,151.89x = 1,728 × 421.30
  4. Step 4: Simplify right side
    1,151.89x = 728,006.40
  5. Step 5: Solve for x
    x = 728,006.40/1,151.89
  6. Step 6: Final answer
    x = 632.01

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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.