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Finding the Fourth Proportional to 13,695.34, 18,899.42 and 7,728.94

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Solution

The fourth proportional to 13,695.34, 18,899.42 and 7,728.94 is: 10,665.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,695.34 : 18,899.42 = 7,728.94 : x
  2. Step 2: Convert to fraction form
    13,695.34/18,899.42 = 7,728.94/x
  3. Step 3: Cross multiply
    13,695.34x = 18,899.42 × 7,728.94
  4. Step 4: Simplify right side
    13,695.34x = 146,072,483.21
  5. Step 5: Solve for x
    x = 146,072,483.21/13,695.34
  6. Step 6: Final answer
    x = 10,665.85

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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.