Home / 18,918.90-28,381.41-6,440.04

Finding the Fourth Proportional to 18,918.90, 28,381.41 and 6,440.04

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Solution

The fourth proportional to 18,918.90, 28,381.41 and 6,440.04 is: 9,661.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.90 : 28,381.41 = 6,440.04 : x
  2. Step 2: Convert to fraction form
    18,918.90/28,381.41 = 6,440.04/x
  3. Step 3: Cross multiply
    18,918.90x = 28,381.41 × 6,440.04
  4. Step 4: Simplify right side
    18,918.90x = 182,777,415.66
  5. Step 5: Solve for x
    x = 182,777,415.66/18,918.90
  6. Step 6: Final answer
    x = 9,661.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.