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Finding the Fourth Proportional to 285,720.80, 428,581.20 and 239,410.40

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Solution

The fourth proportional to 285,720.80, 428,581.20 and 239,410.40 is: 359,115.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,720.80 : 428,581.20 = 239,410.40 : x
  2. Step 2: Convert to fraction form
    285,720.80/428,581.20 = 239,410.40/x
  3. Step 3: Cross multiply
    285,720.80x = 428,581.20 × 239,410.40
  4. Step 4: Simplify right side
    285,720.80x = 102,606,796,524.48
  5. Step 5: Solve for x
    x = 102,606,796,524.48/285,720.80
  6. Step 6: Final answer
    x = 359,115.60

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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.