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Finding the Fourth Proportional to 643,976.86, 888,643.50 and 357,474.32

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Solution

The fourth proportional to 643,976.86, 888,643.50 and 357,474.32 is: 493,289.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,976.86 : 888,643.50 = 357,474.32 : x
  2. Step 2: Convert to fraction form
    643,976.86/888,643.50 = 357,474.32/x
  3. Step 3: Cross multiply
    643,976.86x = 888,643.50 × 357,474.32
  4. Step 4: Simplify right side
    643,976.86x = 317,667,230,884.92
  5. Step 5: Solve for x
    x = 317,667,230,884.92/643,976.86
  6. Step 6: Final answer
    x = 493,289.82

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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.