Home / 631,107.80-870,997.41-389,384.15

Finding the Fourth Proportional to 631,107.80, 870,997.41 and 389,384.15

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Solution

The fourth proportional to 631,107.80, 870,997.41 and 389,384.15 is: 537,392.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,107.80 : 870,997.41 = 389,384.15 : x
  2. Step 2: Convert to fraction form
    631,107.80/870,997.41 = 389,384.15/x
  3. Step 3: Cross multiply
    631,107.80x = 870,997.41 × 389,384.15
  4. Step 4: Simplify right side
    631,107.80x = 339,152,588,322.55
  5. Step 5: Solve for x
    x = 339,152,588,322.55/631,107.80
  6. Step 6: Final answer
    x = 537,392.49

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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.