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Finding the Fourth Proportional to 85,704.48, 128,504.88 and 57,918.24

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Solution

The fourth proportional to 85,704.48, 128,504.88 and 57,918.24 is: 86,842.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,704.48 : 128,504.88 = 57,918.24 : x
  2. Step 2: Convert to fraction form
    85,704.48/128,504.88 = 57,918.24/x
  3. Step 3: Cross multiply
    85,704.48x = 128,504.88 × 57,918.24
  4. Step 4: Simplify right side
    85,704.48x = 7,442,776,481.01
  5. Step 5: Solve for x
    x = 7,442,776,481.01/85,704.48
  6. Step 6: Final answer
    x = 86,842.33

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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.