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Finding the Fourth Proportional to 455,642.64, 628,673.64 and 395,116.56

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Solution

The fourth proportional to 455,642.64, 628,673.64 and 395,116.56 is: 545,162.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,642.64 : 628,673.64 = 395,116.56 : x
  2. Step 2: Convert to fraction form
    455,642.64/628,673.64 = 395,116.56/x
  3. Step 3: Cross multiply
    455,642.64x = 628,673.64 × 395,116.56
  4. Step 4: Simplify right side
    455,642.64x = 248,399,365,999.48
  5. Step 5: Solve for x
    x = 248,399,365,999.48/455,642.64
  6. Step 6: Final answer
    x = 545,162.69

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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.