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Finding the Fourth Proportional to 280,685.25, 387,354.15 and 153,369.05

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Solution

The fourth proportional to 280,685.25, 387,354.15 and 153,369.05 is: 211,653.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,685.25 : 387,354.15 = 153,369.05 : x
  2. Step 2: Convert to fraction form
    280,685.25/387,354.15 = 153,369.05/x
  3. Step 3: Cross multiply
    280,685.25x = 387,354.15 × 153,369.05
  4. Step 4: Simplify right side
    280,685.25x = 59,408,136,062.29
  5. Step 5: Solve for x
    x = 59,408,136,062.29/280,685.25
  6. Step 6: Final answer
    x = 211,653.93

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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.