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Finding the Fourth Proportional to 128,641.18, 192,980.43 and 39,901.81

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Solution

The fourth proportional to 128,641.18, 192,980.43 and 39,901.81 is: 59,858.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,641.18 : 192,980.43 = 39,901.81 : x
  2. Step 2: Convert to fraction form
    128,641.18/192,980.43 = 39,901.81/x
  3. Step 3: Cross multiply
    128,641.18x = 192,980.43 × 39,901.81
  4. Step 4: Simplify right side
    128,641.18x = 7,700,268,451.58
  5. Step 5: Solve for x
    x = 7,700,268,451.58/128,641.18
  6. Step 6: Final answer
    x = 59,858.50

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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.