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Finding the Fourth Proportional to 101,209.78, 139,637.01 and 56,489.14

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Solution

The fourth proportional to 101,209.78, 139,637.01 and 56,489.14 is: 77,936.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,209.78 : 139,637.01 = 56,489.14 : x
  2. Step 2: Convert to fraction form
    101,209.78/139,637.01 = 56,489.14/x
  3. Step 3: Cross multiply
    101,209.78x = 139,637.01 × 56,489.14
  4. Step 4: Simplify right side
    101,209.78x = 7,887,974,607.07
  5. Step 5: Solve for x
    x = 7,887,974,607.07/101,209.78
  6. Step 6: Final answer
    x = 77,936.88

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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.