Home / 20,871,905.31-28,799,981.09-11,930,887.86

Finding the Fourth Proportional to 20,871,905.31, 28,799,981.09 and 11,930,887.86

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Solution

The fourth proportional to 20,871,905.31, 28,799,981.09 and 11,930,887.86 is: 16,462,768.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871,905.31 : 28,799,981.09 = 11,930,887.86 : x
  2. Step 2: Convert to fraction form
    20,871,905.31/28,799,981.09 = 11,930,887.86/x
  3. Step 3: Cross multiply
    20,871,905.31x = 28,799,981.09 × 11,930,887.86
  4. Step 4: Simplify right side
    20,871,905.31x = 343,609,344,631,997
  5. Step 5: Solve for x
    x = 343,609,344,631,997/20,871,905.31
  6. Step 6: Final answer
    x = 16,462,768.47

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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.