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Finding the Fourth Proportional to 64,984.20, 89,640.78 and 39,124.77

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Solution

The fourth proportional to 64,984.20, 89,640.78 and 39,124.77 is: 53,969.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,984.20 : 89,640.78 = 39,124.77 : x
  2. Step 2: Convert to fraction form
    64,984.20/89,640.78 = 39,124.77/x
  3. Step 3: Cross multiply
    64,984.20x = 89,640.78 × 39,124.77
  4. Step 4: Simplify right side
    64,984.20x = 3,507,174,900.12
  5. Step 5: Solve for x
    x = 3,507,174,900.12/64,984.20
  6. Step 6: Final answer
    x = 53,969.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.