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Finding the Fourth Proportional to 137,915, 190,330.80 and 103,863.38

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Solution

The fourth proportional to 137,915, 190,330.80 and 103,863.38 is: 143,337.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,915 : 190,330.80 = 103,863.38 : x
  2. Step 2: Convert to fraction form
    137,915/190,330.80 = 103,863.38/x
  3. Step 3: Cross multiply
    137,915x = 190,330.80 × 103,863.38
  4. Step 4: Simplify right side
    137,915x = 19,768,400,206.10
  5. Step 5: Solve for x
    x = 19,768,400,206.10/137,915
  6. Step 6: Final answer
    x = 143,337.56

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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.