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Finding the Fourth Proportional to 101,428.53, 139,970.61 and 56,716.53

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Solution

The fourth proportional to 101,428.53, 139,970.61 and 56,716.53 is: 78,268.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,428.53 : 139,970.61 = 56,716.53 : x
  2. Step 2: Convert to fraction form
    101,428.53/139,970.61 = 56,716.53/x
  3. Step 3: Cross multiply
    101,428.53x = 139,970.61 × 56,716.53
  4. Step 4: Simplify right side
    101,428.53x = 7,938,647,301.18
  5. Step 5: Solve for x
    x = 7,938,647,301.18/101,428.53
  6. Step 6: Final answer
    x = 78,268.39

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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.