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Finding the Fourth Proportional to 285,705.20, 428,428.20 and 108,153.20

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Solution

The fourth proportional to 285,705.20, 428,428.20 and 108,153.20 is: 162,180.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,705.20 : 428,428.20 = 108,153.20 : x
  2. Step 2: Convert to fraction form
    285,705.20/428,428.20 = 108,153.20/x
  3. Step 3: Cross multiply
    285,705.20x = 428,428.20 × 108,153.20
  4. Step 4: Simplify right side
    285,705.20x = 46,335,880,800.24
  5. Step 5: Solve for x
    x = 46,335,880,800.24/285,705.20
  6. Step 6: Final answer
    x = 162,180.74

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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.