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Finding the Fourth Proportional to 118,539.20, 177,376.80 and 87,435.20

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Solution

The fourth proportional to 118,539.20, 177,376.80 and 87,435.20 is: 130,834.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,539.20 : 177,376.80 = 87,435.20 : x
  2. Step 2: Convert to fraction form
    118,539.20/177,376.80 = 87,435.20/x
  3. Step 3: Cross multiply
    118,539.20x = 177,376.80 × 87,435.20
  4. Step 4: Simplify right side
    118,539.20x = 15,508,975,983.36
  5. Step 5: Solve for x
    x = 15,508,975,983.36/118,539.20
  6. Step 6: Final answer
    x = 130,834.15

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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.