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Finding the Fourth Proportional to 1,347.84, 2,021.72 and 423.40

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Solution

The fourth proportional to 1,347.84, 2,021.72 and 423.40 is: 635.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.84 : 2,021.72 = 423.40 : x
  2. Step 2: Convert to fraction form
    1,347.84/2,021.72 = 423.40/x
  3. Step 3: Cross multiply
    1,347.84x = 2,021.72 × 423.40
  4. Step 4: Simplify right side
    1,347.84x = 855,996.25
  5. Step 5: Solve for x
    x = 855,996.25/1,347.84
  6. Step 6: Final answer
    x = 635.09

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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.