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Finding the Fourth Proportional to 455,328.91, 628,374.92 and 251,408.78

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Solution

The fourth proportional to 455,328.91, 628,374.92 and 251,408.78 is: 346,955.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,328.91 : 628,374.92 = 251,408.78 : x
  2. Step 2: Convert to fraction form
    455,328.91/628,374.92 = 251,408.78/x
  3. Step 3: Cross multiply
    455,328.91x = 628,374.92 × 251,408.78
  4. Step 4: Simplify right side
    455,328.91x = 157,978,972,019.80
  5. Step 5: Solve for x
    x = 157,978,972,019.80/455,328.91
  6. Step 6: Final answer
    x = 346,955.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.