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Finding the Fourth Proportional to 85,806.40, 128,714.49 and 28,857.44

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Solution

The fourth proportional to 85,806.40, 128,714.49 and 28,857.44 is: 43,287.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,806.40 : 128,714.49 = 28,857.44 : x
  2. Step 2: Convert to fraction form
    85,806.40/128,714.49 = 28,857.44/x
  3. Step 3: Cross multiply
    85,806.40x = 128,714.49 × 28,857.44
  4. Step 4: Simplify right side
    85,806.40x = 3,714,370,672.31
  5. Step 5: Solve for x
    x = 3,714,370,672.31/85,806.40
  6. Step 6: Final answer
    x = 43,287.80

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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.