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Finding the Fourth Proportional to 85,709.99, 128,571.47 and 26,551.64

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Solution

The fourth proportional to 85,709.99, 128,571.47 and 26,551.64 is: 39,829.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,709.99 : 128,571.47 = 26,551.64 : x
  2. Step 2: Convert to fraction form
    85,709.99/128,571.47 = 26,551.64/x
  3. Step 3: Cross multiply
    85,709.99x = 128,571.47 × 26,551.64
  4. Step 4: Simplify right side
    85,709.99x = 3,413,783,385.71
  5. Step 5: Solve for x
    x = 3,413,783,385.71/85,709.99
  6. Step 6: Final answer
    x = 39,829.47

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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.