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Finding the Fourth Proportional to 425,665.92, 638,480.40 and 105,811.03

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Solution

The fourth proportional to 425,665.92, 638,480.40 and 105,811.03 is: 158,711.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,665.92 : 638,480.40 = 105,811.03 : x
  2. Step 2: Convert to fraction form
    425,665.92/638,480.40 = 105,811.03/x
  3. Step 3: Cross multiply
    425,665.92x = 638,480.40 × 105,811.03
  4. Step 4: Simplify right side
    425,665.92x = 67,558,268,758.81
  5. Step 5: Solve for x
    x = 67,558,268,758.81/425,665.92
  6. Step 6: Final answer
    x = 158,711.95

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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.