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Finding the Fourth Proportional to 280,911.31, 387,659.23 and 153,586.90

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Solution

The fourth proportional to 280,911.31, 387,659.23 and 153,586.90 is: 211,950.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,911.31 : 387,659.23 = 153,586.90 : x
  2. Step 2: Convert to fraction form
    280,911.31/387,659.23 = 153,586.90/x
  3. Step 3: Cross multiply
    280,911.31x = 387,659.23 × 153,586.90
  4. Step 4: Simplify right side
    280,911.31x = 59,539,379,492.69
  5. Step 5: Solve for x
    x = 59,539,379,492.69/280,911.31
  6. Step 6: Final answer
    x = 211,950.81

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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.