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Finding the Fourth Proportional to 103,639.85, 155,459.78 and 91,975.85

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Solution

The fourth proportional to 103,639.85, 155,459.78 and 91,975.85 is: 137,963.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.85 : 155,459.78 = 91,975.85 : x
  2. Step 2: Convert to fraction form
    103,639.85/155,459.78 = 91,975.85/x
  3. Step 3: Cross multiply
    103,639.85x = 155,459.78 × 91,975.85
  4. Step 4: Simplify right side
    103,639.85x = 14,298,545,406.31
  5. Step 5: Solve for x
    x = 14,298,545,406.31/103,639.85
  6. Step 6: Final answer
    x = 137,963.78

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1.5x scale

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.