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Finding the Fourth Proportional to 283,689.12, 391,486.32 and 156,376.56

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Solution

The fourth proportional to 283,689.12, 391,486.32 and 156,376.56 is: 215,797.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,689.12 : 391,486.32 = 156,376.56 : x
  2. Step 2: Convert to fraction form
    283,689.12/391,486.32 = 156,376.56/x
  3. Step 3: Cross multiply
    283,689.12x = 391,486.32 × 156,376.56
  4. Step 4: Simplify right side
    283,689.12x = 61,219,284,008.66
  5. Step 5: Solve for x
    x = 61,219,284,008.66/283,689.12
  6. Step 6: Final answer
    x = 215,797.08

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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.