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Finding the Fourth Proportional to 9,905.03, 13,668.99 and 5,428.77

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Solution

The fourth proportional to 9,905.03, 13,668.99 and 5,428.77 is: 7,491.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,905.03 : 13,668.99 = 5,428.77 : x
  2. Step 2: Convert to fraction form
    9,905.03/13,668.99 = 5,428.77/x
  3. Step 3: Cross multiply
    9,905.03x = 13,668.99 × 5,428.77
  4. Step 4: Simplify right side
    9,905.03x = 74,205,707.35
  5. Step 5: Solve for x
    x = 74,205,707.35/9,905.03
  6. Step 6: Final answer
    x = 7,491.72

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1.5x scale

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.