Home / 18,378.18-25,361.12-10,420.25

Finding the Fourth Proportional to 18,378.18, 25,361.12 and 10,420.25

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Solution

The fourth proportional to 18,378.18, 25,361.12 and 10,420.25 is: 14,379.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,378.18 : 25,361.12 = 10,420.25 : x
  2. Step 2: Convert to fraction form
    18,378.18/25,361.12 = 10,420.25/x
  3. Step 3: Cross multiply
    18,378.18x = 25,361.12 × 10,420.25
  4. Step 4: Simplify right side
    18,378.18x = 264,269,031.77
  5. Step 5: Solve for x
    x = 264,269,031.77/18,378.18
  6. Step 6: Final answer
    x = 14,379.50

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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.