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Finding the Fourth Proportional to 71,322.58, 98,428.21 and 39,491.45

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Solution

The fourth proportional to 71,322.58, 98,428.21 and 39,491.45 is: 54,499.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,322.58 : 98,428.21 = 39,491.45 : x
  2. Step 2: Convert to fraction form
    71,322.58/98,428.21 = 39,491.45/x
  3. Step 3: Cross multiply
    71,322.58x = 98,428.21 × 39,491.45
  4. Step 4: Simplify right side
    71,322.58x = 3,887,072,734.18
  5. Step 5: Solve for x
    x = 3,887,072,734.18/71,322.58
  6. Step 6: Final answer
    x = 54,499.89

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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.