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Finding the Fourth Proportional to 85,735.05, 128,682.36 and 43,646.64

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Solution

The fourth proportional to 85,735.05, 128,682.36 and 43,646.64 is: 65,510.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,735.05 : 128,682.36 = 43,646.64 : x
  2. Step 2: Convert to fraction form
    85,735.05/128,682.36 = 43,646.64/x
  3. Step 3: Cross multiply
    85,735.05x = 128,682.36 × 43,646.64
  4. Step 4: Simplify right side
    85,735.05x = 5,616,552,641.27
  5. Step 5: Solve for x
    x = 5,616,552,641.27/85,735.05
  6. Step 6: Final answer
    x = 65,510.58

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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.