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Finding the Fourth Proportional to 18,840, 25,999.20 and 10,456.32

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Solution

The fourth proportional to 18,840, 25,999.20 and 10,456.32 is: 14,429.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,840 : 25,999.20 = 10,456.32 : x
  2. Step 2: Convert to fraction form
    18,840/25,999.20 = 10,456.32/x
  3. Step 3: Cross multiply
    18,840x = 25,999.20 × 10,456.32
  4. Step 4: Simplify right side
    18,840x = 271,855,954.94
  5. Step 5: Solve for x
    x = 271,855,954.94/18,840
  6. Step 6: Final answer
    x = 14,429.72

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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.