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Finding the Fourth Proportional to 18,361.87, 25,339.76 and 9,978.91

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Solution

The fourth proportional to 18,361.87, 25,339.76 and 9,978.91 is: 13,771.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,361.87 : 25,339.76 = 9,978.91 : x
  2. Step 2: Convert to fraction form
    18,361.87/25,339.76 = 9,978.91/x
  3. Step 3: Cross multiply
    18,361.87x = 25,339.76 × 9,978.91
  4. Step 4: Simplify right side
    18,361.87x = 252,863,184.46
  5. Step 5: Solve for x
    x = 252,863,184.46/18,361.87
  6. Step 6: Final answer
    x = 13,771.10

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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.