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Finding the Fourth Proportional to 9,905.05, 13,668.92 and 5,428.99

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Solution

The fourth proportional to 9,905.05, 13,668.92 and 5,428.99 is: 7,491.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,905.05 : 13,668.92 = 5,428.99 : x
  2. Step 2: Convert to fraction form
    9,905.05/13,668.92 = 5,428.99/x
  3. Step 3: Cross multiply
    9,905.05x = 13,668.92 × 5,428.99
  4. Step 4: Simplify right side
    9,905.05x = 74,208,368.67
  5. Step 5: Solve for x
    x = 74,208,368.67/9,905.05
  6. Step 6: Final answer
    x = 7,491.98

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