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Finding the Fourth Proportional to 12,950,978.21, 17,871,880.05 and 7,149,635.49

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Solution

The fourth proportional to 12,950,978.21, 17,871,880.05 and 7,149,635.49 is: 9,866,237.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,950,978.21 : 17,871,880.05 = 7,149,635.49 : x
  2. Step 2: Convert to fraction form
    12,950,978.21/17,871,880.05 = 7,149,635.49/x
  3. Step 3: Cross multiply
    12,950,978.21x = 17,871,880.05 × 7,149,635.49
  4. Step 4: Simplify right side
    12,950,978.21x = 127,777,427,878,502.98
  5. Step 5: Solve for x
    x = 127,777,427,878,502.98/12,950,978.21
  6. Step 6: Final answer
    x = 9,866,237.58

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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.