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Finding the Fourth Proportional to 18,378.66, 25,361.78 and 10,421.42

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Solution

The fourth proportional to 18,378.66, 25,361.78 and 10,421.42 is: 14,381.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,378.66 : 25,361.78 = 10,421.42 : x
  2. Step 2: Convert to fraction form
    18,378.66/25,361.78 = 10,421.42/x
  3. Step 3: Cross multiply
    18,378.66x = 25,361.78 × 10,421.42
  4. Step 4: Simplify right side
    18,378.66x = 264,305,582.41
  5. Step 5: Solve for x
    x = 264,305,582.41/18,378.66
  6. Step 6: Final answer
    x = 14,381.11

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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.