Home / 103,639.10-155,458.65-91,391.90

Finding the Fourth Proportional to 103,639.10, 155,458.65 and 91,391.90

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Solution

The fourth proportional to 103,639.10, 155,458.65 and 91,391.90 is: 137,087.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.10 : 155,458.65 = 91,391.90 : x
  2. Step 2: Convert to fraction form
    103,639.10/155,458.65 = 91,391.90/x
  3. Step 3: Cross multiply
    103,639.10x = 155,458.65 × 91,391.90
  4. Step 4: Simplify right side
    103,639.10x = 14,207,661,394.94
  5. Step 5: Solve for x
    x = 14,207,661,394.94/103,639.10
  6. Step 6: Final answer
    x = 137,087.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.