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Finding the Fourth Proportional to 455,086.71, 628,015.28 and 251,139.51

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Solution

The fourth proportional to 455,086.71, 628,015.28 and 251,139.51 is: 346,570.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,086.71 : 628,015.28 = 251,139.51 : x
  2. Step 2: Convert to fraction form
    455,086.71/628,015.28 = 251,139.51/x
  3. Step 3: Cross multiply
    455,086.71x = 628,015.28 × 251,139.51
  4. Step 4: Simplify right side
    455,086.71x = 157,719,448,436.02
  5. Step 5: Solve for x
    x = 157,719,448,436.02/455,086.71
  6. Step 6: Final answer
    x = 346,570.10

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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.