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Finding the Fourth Proportional to 1,347.51, 2,021.28 and 423.21

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Solution

The fourth proportional to 1,347.51, 2,021.28 and 423.21 is: 634.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.51 : 2,021.28 = 423.21 : x
  2. Step 2: Convert to fraction form
    1,347.51/2,021.28 = 423.21/x
  3. Step 3: Cross multiply
    1,347.51x = 2,021.28 × 423.21
  4. Step 4: Simplify right side
    1,347.51x = 855,425.91
  5. Step 5: Solve for x
    x = 855,425.91/1,347.51
  6. Step 6: Final answer
    x = 634.82

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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.