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Finding the Fourth Proportional to 139,887.44, 193,038.61 and 79,457.90

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Solution

The fourth proportional to 139,887.44, 193,038.61 and 79,457.90 is: 109,648.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,887.44 : 193,038.61 = 79,457.90 : x
  2. Step 2: Convert to fraction form
    139,887.44/193,038.61 = 79,457.90/x
  3. Step 3: Cross multiply
    139,887.44x = 193,038.61 × 79,457.90
  4. Step 4: Simplify right side
    139,887.44x = 15,338,442,569.52
  5. Step 5: Solve for x
    x = 15,338,442,569.52/139,887.44
  6. Step 6: Final answer
    x = 109,648.46

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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.