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Finding the Fourth Proportional to 316,121.85, 436,239.30 and 172,878.81

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Solution

The fourth proportional to 316,121.85, 436,239.30 and 172,878.81 is: 238,567.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,121.85 : 436,239.30 = 172,878.81 : x
  2. Step 2: Convert to fraction form
    316,121.85/436,239.30 = 172,878.81/x
  3. Step 3: Cross multiply
    316,121.85x = 436,239.30 × 172,878.81
  4. Step 4: Simplify right side
    316,121.85x = 75,416,531,059.23
  5. Step 5: Solve for x
    x = 75,416,531,059.23/316,121.85
  6. Step 6: Final answer
    x = 238,567.92

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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.