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Finding the Fourth Proportional to 387,406.90, 579,410.63 and 345,011.31

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Solution

The fourth proportional to 387,406.90, 579,410.63 and 345,011.31 is: 516,003.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,406.90 : 579,410.63 = 345,011.31 : x
  2. Step 2: Convert to fraction form
    387,406.90/579,410.63 = 345,011.31/x
  3. Step 3: Cross multiply
    387,406.90x = 579,410.63 × 345,011.31
  4. Step 4: Simplify right side
    387,406.90x = 199,903,218,449.70
  5. Step 5: Solve for x
    x = 199,903,218,449.70/387,406.90
  6. Step 6: Final answer
    x = 516,003.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.