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Finding the Fourth Proportional to 283,409.91, 391,123.35 and 156,085.47

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Solution

The fourth proportional to 283,409.91, 391,123.35 and 156,085.47 is: 215,407.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,409.91 : 391,123.35 = 156,085.47 : x
  2. Step 2: Convert to fraction form
    283,409.91/391,123.35 = 156,085.47/x
  3. Step 3: Cross multiply
    283,409.91x = 391,123.35 × 156,085.47
  4. Step 4: Simplify right side
    283,409.91x = 61,048,671,912.72
  5. Step 5: Solve for x
    x = 61,048,671,912.72/283,409.91
  6. Step 6: Final answer
    x = 215,407.68

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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.