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Finding the Fourth Proportional to 285,404.75, 393,853.58 and 156,345.78

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Solution

The fourth proportional to 285,404.75, 393,853.58 and 156,345.78 is: 215,754.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,404.75 : 393,853.58 = 156,345.78 : x
  2. Step 2: Convert to fraction form
    285,404.75/393,853.58 = 156,345.78/x
  3. Step 3: Cross multiply
    285,404.75x = 393,853.58 × 156,345.78
  4. Step 4: Simplify right side
    285,404.75x = 61,577,346,452.41
  5. Step 5: Solve for x
    x = 61,577,346,452.41/285,404.75
  6. Step 6: Final answer
    x = 215,754.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.