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Finding the Fourth Proportional to 485,690.88, 728,812.80 and 387,816.96

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Solution

The fourth proportional to 485,690.88, 728,812.80 and 387,816.96 is: 581,946.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,690.88 : 728,812.80 = 387,816.96 : x
  2. Step 2: Convert to fraction form
    485,690.88/728,812.80 = 387,816.96/x
  3. Step 3: Cross multiply
    485,690.88x = 728,812.80 × 387,816.96
  4. Step 4: Simplify right side
    485,690.88x = 282,645,964,505.09
  5. Step 5: Solve for x
    x = 282,645,964,505.09/485,690.88
  6. Step 6: Final answer
    x = 581,946.21

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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.