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Finding the Fourth Proportional to 1,408.62, 2,112.93 and 434.73

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Solution

The fourth proportional to 1,408.62, 2,112.93 and 434.73 is: 652.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.62 : 2,112.93 = 434.73 : x
  2. Step 2: Convert to fraction form
    1,408.62/2,112.93 = 434.73/x
  3. Step 3: Cross multiply
    1,408.62x = 2,112.93 × 434.73
  4. Step 4: Simplify right side
    1,408.62x = 918,554.06
  5. Step 5: Solve for x
    x = 918,554.06/1,408.62
  6. Step 6: Final answer
    x = 652.10

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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.