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Finding the Fourth Proportional to 387,639.60, 581,632.20 and 177,169.20

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Solution

The fourth proportional to 387,639.60, 581,632.20 and 177,169.20 is: 265,832.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,639.60 : 581,632.20 = 177,169.20 : x
  2. Step 2: Convert to fraction form
    387,639.60/581,632.20 = 177,169.20/x
  3. Step 3: Cross multiply
    387,639.60x = 581,632.20 × 177,169.20
  4. Step 4: Simplify right side
    387,639.60x = 103,047,311,568.24
  5. Step 5: Solve for x
    x = 103,047,311,568.24/387,639.60
  6. Step 6: Final answer
    x = 265,832.78

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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.