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Finding the Fourth Proportional to 716,468.80, 988,726.90 and 394,171.98

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Solution

The fourth proportional to 716,468.80, 988,726.90 and 394,171.98 is: 543,957.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,468.80 : 988,726.90 = 394,171.98 : x
  2. Step 2: Convert to fraction form
    716,468.80/988,726.90 = 394,171.98/x
  3. Step 3: Cross multiply
    716,468.80x = 988,726.90 × 394,171.98
  4. Step 4: Simplify right side
    716,468.80x = 389,728,434,908.63
  5. Step 5: Solve for x
    x = 389,728,434,908.63/716,468.80
  6. Step 6: Final answer
    x = 543,957.30

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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.