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Finding the Fourth Proportional to 66,457.53, 91,721.16 and 39,615.75

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Solution

The fourth proportional to 66,457.53, 91,721.16 and 39,615.75 is: 54,675.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,457.53 : 91,721.16 = 39,615.75 : x
  2. Step 2: Convert to fraction form
    66,457.53/91,721.16 = 39,615.75/x
  3. Step 3: Cross multiply
    66,457.53x = 91,721.16 × 39,615.75
  4. Step 4: Simplify right side
    66,457.53x = 3,633,602,544.27
  5. Step 5: Solve for x
    x = 3,633,602,544.27/66,457.53
  6. Step 6: Final answer
    x = 54,675.56

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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.