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Finding the Fourth Proportional to 515,857.80, 774,369.90 and 398,051.40

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Solution

The fourth proportional to 515,857.80, 774,369.90 and 398,051.40 is: 597,527.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,857.80 : 774,369.90 = 398,051.40 : x
  2. Step 2: Convert to fraction form
    515,857.80/774,369.90 = 398,051.40/x
  3. Step 3: Cross multiply
    515,857.80x = 774,369.90 × 398,051.40
  4. Step 4: Simplify right side
    515,857.80x = 308,239,022,812.86
  5. Step 5: Solve for x
    x = 308,239,022,812.86/515,857.80
  6. Step 6: Final answer
    x = 597,527.11

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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.