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Finding the Fourth Proportional to 1,408.47, 2,112.95 and 434.55

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Solution

The fourth proportional to 1,408.47, 2,112.95 and 434.55 is: 651.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.47 : 2,112.95 = 434.55 : x
  2. Step 2: Convert to fraction form
    1,408.47/2,112.95 = 434.55/x
  3. Step 3: Cross multiply
    1,408.47x = 2,112.95 × 434.55
  4. Step 4: Simplify right side
    1,408.47x = 918,180.25
  5. Step 5: Solve for x
    x = 918,180.25/1,408.47
  6. Step 6: Final answer
    x = 651.90

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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.