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Finding the Fourth Proportional to 85,845.72, 128,805.58 and 46,430.58

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Solution

The fourth proportional to 85,845.72, 128,805.58 and 46,430.58 is: 69,665.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,845.72 : 128,805.58 = 46,430.58 : x
  2. Step 2: Convert to fraction form
    85,845.72/128,805.58 = 46,430.58/x
  3. Step 3: Cross multiply
    85,845.72x = 128,805.58 × 46,430.58
  4. Step 4: Simplify right side
    85,845.72x = 5,980,517,786.64
  5. Step 5: Solve for x
    x = 5,980,517,786.64/85,845.72
  6. Step 6: Final answer
    x = 69,665.88

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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.