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Finding the Fourth Proportional to 18,378.78, 25,361.94 and 10,421.54

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Solution

The fourth proportional to 18,378.78, 25,361.94 and 10,421.54 is: 14,381.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,378.78 : 25,361.94 = 10,421.54 : x
  2. Step 2: Convert to fraction form
    18,378.78/25,361.94 = 10,421.54/x
  3. Step 3: Cross multiply
    18,378.78x = 25,361.94 × 10,421.54
  4. Step 4: Simplify right side
    18,378.78x = 264,310,472.19
  5. Step 5: Solve for x
    x = 264,310,472.19/18,378.78
  6. Step 6: Final answer
    x = 14,381.28

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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.