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Finding the Fourth Proportional to 64,989.04, 89,690.91 and 39,489.54

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Solution

The fourth proportional to 64,989.04, 89,690.91 and 39,489.54 is: 54,499.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,989.04 : 89,690.91 = 39,489.54 : x
  2. Step 2: Convert to fraction form
    64,989.04/89,690.91 = 39,489.54/x
  3. Step 3: Cross multiply
    64,989.04x = 89,690.91 × 39,489.54
  4. Step 4: Simplify right side
    64,989.04x = 3,541,852,778.08
  5. Step 5: Solve for x
    x = 3,541,852,778.08/64,989.04
  6. Step 6: Final answer
    x = 54,499.23

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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.