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Finding the Fourth Proportional to 391,691.89, 540,529.36 and 217,256.77

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Solution

The fourth proportional to 391,691.89, 540,529.36 and 217,256.77 is: 299,811.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,691.89 : 540,529.36 = 217,256.77 : x
  2. Step 2: Convert to fraction form
    391,691.89/540,529.36 = 217,256.77/x
  3. Step 3: Cross multiply
    391,691.89x = 540,529.36 × 217,256.77
  4. Step 4: Simplify right side
    391,691.89x = 117,433,662,843.77
  5. Step 5: Solve for x
    x = 117,433,662,843.77/391,691.89
  6. Step 6: Final answer
    x = 299,811.32

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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.