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Finding the Fourth Proportional to 64,990.71, 89,693.16 and 39,491.19

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Solution

The fourth proportional to 64,990.71, 89,693.16 and 39,491.19 is: 54,501.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,990.71 : 89,693.16 = 39,491.19 : x
  2. Step 2: Convert to fraction form
    64,990.71/89,693.16 = 39,491.19/x
  3. Step 3: Cross multiply
    64,990.71x = 89,693.16 × 39,491.19
  4. Step 4: Simplify right side
    64,990.71x = 3,542,089,623.26
  5. Step 5: Solve for x
    x = 3,542,089,623.26/64,990.71
  6. Step 6: Final answer
    x = 54,501.48

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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.