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Finding the Fourth Proportional to 280,691.74, 387,350.04 and 153,364.60

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Solution

The fourth proportional to 280,691.74, 387,350.04 and 153,364.60 is: 211,640.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,691.74 : 387,350.04 = 153,364.60 : x
  2. Step 2: Convert to fraction form
    280,691.74/387,350.04 = 153,364.60/x
  3. Step 3: Cross multiply
    280,691.74x = 387,350.04 × 153,364.60
  4. Step 4: Simplify right side
    280,691.74x = 59,405,783,944.58
  5. Step 5: Solve for x
    x = 59,405,783,944.58/280,691.74
  6. Step 6: Final answer
    x = 211,640.66

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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.