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Finding the Fourth Proportional to 64,083.12, 87,792.42 and 61,687.21

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Solution

The fourth proportional to 64,083.12, 87,792.42 and 61,687.21 is: 84,510.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,083.12 : 87,792.42 = 61,687.21 : x
  2. Step 2: Convert to fraction form
    64,083.12/87,792.42 = 61,687.21/x
  3. Step 3: Cross multiply
    64,083.12x = 87,792.42 × 61,687.21
  4. Step 4: Simplify right side
    64,083.12x = 5,415,669,448.95
  5. Step 5: Solve for x
    x = 5,415,669,448.95/64,083.12
  6. Step 6: Final answer
    x = 84,510.08

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.