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Finding the Fourth Proportional to 643,519.96, 888,112.69 and 353,187.63

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Solution

The fourth proportional to 643,519.96, 888,112.69 and 353,187.63 is: 487,429.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,519.96 : 888,112.69 = 353,187.63 : x
  2. Step 2: Convert to fraction form
    643,519.96/888,112.69 = 353,187.63/x
  3. Step 3: Cross multiply
    643,519.96x = 888,112.69 × 353,187.63
  4. Step 4: Simplify right side
    643,519.96x = 313,670,415,271.06
  5. Step 5: Solve for x
    x = 313,670,415,271.06/643,519.96
  6. Step 6: Final answer
    x = 487,429.20

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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.