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Finding the Fourth Proportional to 118,107.49, 162,991.41 and 72,815.40

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Solution

The fourth proportional to 118,107.49, 162,991.41 and 72,815.40 is: 100,487.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,107.49 : 162,991.41 = 72,815.40 : x
  2. Step 2: Convert to fraction form
    118,107.49/162,991.41 = 72,815.40/x
  3. Step 3: Cross multiply
    118,107.49x = 162,991.41 × 72,815.40
  4. Step 4: Simplify right side
    118,107.49x = 11,868,284,715.71
  5. Step 5: Solve for x
    x = 11,868,284,715.71/118,107.49
  6. Step 6: Final answer
    x = 100,487.15

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1.5x scale

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.