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Finding the Fourth Proportional to 211,085.70, 316,628.55 and 105,866.70

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Solution

The fourth proportional to 211,085.70, 316,628.55 and 105,866.70 is: 158,800.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,085.70 : 316,628.55 = 105,866.70 : x
  2. Step 2: Convert to fraction form
    211,085.70/316,628.55 = 105,866.70/x
  3. Step 3: Cross multiply
    211,085.70x = 316,628.55 × 105,866.70
  4. Step 4: Simplify right side
    211,085.70x = 33,520,419,714.29
  5. Step 5: Solve for x
    x = 33,520,419,714.29/211,085.70
  6. Step 6: Final answer
    x = 158,800.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.