Home / 103,174.28-142,439.49-78,930.57

Finding the Fourth Proportional to 103,174.28, 142,439.49 and 78,930.57

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Solution

The fourth proportional to 103,174.28, 142,439.49 and 78,930.57 is: 108,969.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,174.28 : 142,439.49 = 78,930.57 : x
  2. Step 2: Convert to fraction form
    103,174.28/142,439.49 = 78,930.57/x
  3. Step 3: Cross multiply
    103,174.28x = 142,439.49 × 78,930.57
  4. Step 4: Simplify right side
    103,174.28x = 11,242,830,136.21
  5. Step 5: Solve for x
    x = 11,242,830,136.21/103,174.28
  6. Step 6: Final answer
    x = 108,969.32

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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.