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Finding the Fourth Proportional to 86,514.60, 129,728.70 and 39,714.60

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Solution

The fourth proportional to 86,514.60, 129,728.70 and 39,714.60 is: 59,552.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,514.60 : 129,728.70 = 39,714.60 : x
  2. Step 2: Convert to fraction form
    86,514.60/129,728.70 = 39,714.60/x
  3. Step 3: Cross multiply
    86,514.60x = 129,728.70 × 39,714.60
  4. Step 4: Simplify right side
    86,514.60x = 5,152,123,429.02
  5. Step 5: Solve for x
    x = 5,152,123,429.02/86,514.60
  6. Step 6: Final answer
    x = 59,552.07

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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.