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Finding the Fourth Proportional to 455,349.15, 628,378.89 and 251,412.78

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Solution

The fourth proportional to 455,349.15, 628,378.89 and 251,412.78 is: 346,948.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,349.15 : 628,378.89 = 251,412.78 : x
  2. Step 2: Convert to fraction form
    455,349.15/628,378.89 = 251,412.78/x
  3. Step 3: Cross multiply
    455,349.15x = 628,378.89 × 251,412.78
  4. Step 4: Simplify right side
    455,349.15x = 157,982,483,628.21
  5. Step 5: Solve for x
    x = 157,982,483,628.21/455,349.15
  6. Step 6: Final answer
    x = 346,948.01

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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.